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Investing in Heating and Cooling in Niles: Things to Consider

At Deljo Heating, Cooling & Plumbing, we’ve provided AC repair in Niles and other Chicagoland communities for generations, and we know that the system keeping your home or office cool and comfortable for months on end represents a considerable investment.

To help you get the most return for your hard-earned money, we want to point out a few things for you to consider before investing in an AC system.

How large should the air conditioner be?

When you contact Deljo for a free, no-obligation estimate, our experienced, NATE-certified technician will first conduct what’s called a Manual load calculation. This HVAC industry standard takes into consideration a host of factors including your home or office’s size and layout, its orientation, the amount of shade, if any, and the number and location of windows and outside doors.

With this information, we can provide an updated calculation of your home or office’s cooling needs, and from there we’ll design a system that will cool your property efficiently and effectively.

How efficient is the new system?

Today, air conditioner efficiency is measured by the Seasonal Energy Efficiency Ratio (SEER) which indicates how effectively the AC system removes heat from air conditioned space. The government now requires that all AC units have a SEER rating of 13 or higher. Air conditioners with a higher SEER rating are more efficient, and that can lead to considerable savings on your utility bill.

How long will installation take?

If you’re purchasing a new system, you doubtless want the work completed as quickly as possible, especially if it’s being done in the summer! Depending on the project, installation may take several days, but when you work with Deljo we’ll explain the entire process and give you a reliable timeline for completion of the work.

What’s the total cost?

When it comes to a major investment like a new AC, you want to know exactly what you’re etting into. Our technician can explain the total cost breakdown, including the price of the system, labor costs and charges for extras such as air quality components and new thermostats. And don’t forget, Deljo offers a variety of finance options suitable for virtually any budget.

So, if you’re ready to take the plunge, not just for AC repair in Niles but for a new AC system, call Deljo today at 773-829-4295, and let’s get to work. We also provide plumbing services in Niles, IL.

Recent Jobs and Reviews in Niles, IL

Niles, IL at a glance

Deljo Heating, Cooling & Plumbing has completed 20 jobs in Niles, IL between June 2026 and October 2026.

The most recent job was on October 21, 2026.

Deljo Heating, Cooling & Plumbing has completed 41 jobs in Niles, IL in the last 12 months.

Job Locations and Reviews

Performed a maintenance inspection and tune-up on the gas furnace, including removal of the access panel to inspect the burner assembly, gas valve, and associated wiring. Checked gas connections and fittings for leaks using an electronic combustible gas detector, and inspected the refrigerant and condensate lines for insulation condition and corrosion. Noted dust and debris buildup around the base of the unit and tarnishing on the copper line set.
Performed a maintenance inspection and tune-up on the gas furnace, including removal of the access panel to inspect the burner assembly, gas valve, and associated wiring. Checked gas connections and fittings for leaks using an electronic combustible gas detector, and inspected the refrigerant and condensate lines for insulation condition and corrosion. Noted dust and debris buildup around the base of the unit and tarnishing on the copper line set.
Angel G.
Angel G. Checked in
Performed a maintenance inspection and tune-up on the gas furnace, including removal of the access panel to inspect the burner assembly, gas valve, and associated wiring. Checked gas connections and fittings for leaks using an electronic combustible gas detector, and inspected the refrigerant and condensate lines for insulation condition and corrosion. Noted dust and debris buildup around the base of the unit and tarnishing on the copper line set.
Niles, IL 60714
Completed comprehensive maintenance on furnace and humidifier system per maintenance agreement #35. Performed standard cleaning and inspection procedures, verified system operation with digital temperature measurements showing proper functionality at 1.1 degrees differential, and replaced humidifier evaporator pads with new honeycomb-structured filters in black frames to ensure optimal humidity control and air quality for the upcoming heating season.
Completed comprehensive maintenance on furnace and humidifier system per maintenance agreement #35. Performed standard cleaning and inspection procedures, verified system operation with digital temperature measurements showing proper functionality at 1.1 degrees differential, and replaced humidifier evaporator pads with new honeycomb-structured filters in black frames to ensure optimal humidity control and air quality for the upcoming heating season.
Gabe G.
Gabe G. Checked in
Completed comprehensive maintenance on furnace and humidifier system per maintenance agreement #35. Performed standard cleaning and inspection procedures, verified system operation with digital temperature measurements showing proper functionality at 1.1 degrees differential, and replaced humidifier evaporator pads with new honeycomb-structured filters in black frames to ensure optimal humidity control and air quality for the upcoming heating season.
Niles, IL 60714
Completed comprehensive maintenance on two furnaces and one humidifier as part of preventative maintenance agreement. Performed cleaning and inspection procedures on both heating units, including blower wheel assemblies and internal components. Verified proper operation of humidifier system and confirmed filter size requirements at 14x25x1. All equipment inspected, cleaned, and returned to normal operating condition with photographic documentation of work performed.
Completed comprehensive maintenance on two furnaces and one humidifier as part of preventative maintenance agreement. Performed cleaning and inspection procedures on both heating units, including blower wheel assemblies and internal components. Verified proper operation of humidifier system and confirmed filter size requirements at 14x25x1. All equipment inspected, cleaned, and returned to normal operating condition with photographic documentation of work performed.
Sam A.
Sam A. Checked in
Completed comprehensive maintenance on two furnaces and one humidifier as part of preventative maintenance agreement. Performed cleaning and inspection procedures on both heating units, including blower wheel assemblies and internal components. Verified proper operation of humidifier system and confirmed filter size requirements at 14x25x1. All equipment inspected, cleaned, and returned to normal operating condition with photographic documentation of work performed.
Niles, IL 60714
Completed scheduled maintenance inspection on furnace system per maintenance agreement. Inspected and documented ECM blower motor assembly, verifying proper operation of electronically commutated motor drive control board and associated wiring connections. Examined blower wheel assembly for cleanliness and mechanical integrity, confirmed secure mounting and proper clearances.
Completed scheduled maintenance inspection on furnace system per maintenance agreement. Inspected and documented ECM blower motor assembly, verifying proper operation of electronically commutated motor drive control board and associated wiring connections. Examined blower wheel assembly for cleanliness and mechanical integrity, confirmed secure mounting and proper clearances.
Sam A.
Sam A. Checked in
Completed scheduled maintenance inspection on furnace system per maintenance agreement. Inspected and documented ECM blower motor assembly, verifying proper operation of electronically commutated motor drive control board and associated wiring connections. Examined blower wheel assembly for cleanliness and mechanical integrity, confirmed secure mounting and proper clearances.
Niles, IL 60714
Completed comprehensive HVAC maintenance agreement service on air handler system with heat strip and air conditioning components. Performed thorough inspection of internal electrical and mechanical components, including blower motor, capacitors, wiring connections, and control board housed within closet installation. Verified proper operation of all electrical connections and components, inspected refrigerant lines, and confirmed heat strip functionality. Installed new 16x20x1 filter as part of routine maintenance protocol. Verified smart thermostat operation displaying 70°F setpoint with heating mode engaged. All system components found operational with no deficiencies noted during inspection.
Completed comprehensive HVAC maintenance agreement service on air handler system with heat strip and air conditioning components. Performed thorough inspection of internal electrical and mechanical components, including blower motor, capacitors, wiring connections, and control board housed within closet installation. Verified proper operation of all electrical connections and components, inspected refrigerant lines, and confirmed heat strip functionality. Installed new 16x20x1 filter as part of routine maintenance protocol. Verified smart thermostat operation displaying 70°F setpoint with heating mode engaged. All system components found operational with no deficiencies noted during inspection.
Izzy G.
Izzy G. Checked in
Completed comprehensive HVAC maintenance agreement service on air handler system with heat strip and air conditioning components. Performed thorough inspection of internal electrical and mechanical components, including blower motor, capacitors, wiring connections, and control board housed within closet installation. Verified proper operation of all electrical connections and components, inspected refrigerant lines, and confirmed heat strip functionality. Installed new 16x20x1 filter as part of routine maintenance protocol. Verified smart thermostat operation displaying 70°F setpoint with heating mode engaged. All system components found operational with no deficiencies noted during inspection.
Niles, IL 60714
Performed comprehensive maintenance inspection on boiler system as part of scheduled agreement service. Conducted thorough evaluation of gas valve assembly, burner components, and pressure/temperature controls. Verified proper operation of gas train components and confirmed all safety mechanisms functioning within manufacturer specifications. Inspected pressure gauge readings and documented system parameters, with temperature and PSI levels showing normal operating ranges. All electrical connections to gas valve assembly examined and found secure. System operating efficiently with no deficiencies noted during inspection.
Performed comprehensive maintenance inspection on boiler system as part of scheduled agreement service. Conducted thorough evaluation of gas valve assembly, burner components, and pressure/temperature controls. Verified proper operation of gas train components and confirmed all safety mechanisms functioning within manufacturer specifications. Inspected pressure gauge readings and documented system parameters, with temperature and PSI levels showing normal operating ranges. All electrical connections to gas valve assembly examined and found secure. System operating efficiently with no deficiencies noted during inspection.
Sam A.
Sam A. Checked in
Performed comprehensive maintenance inspection on boiler system as part of scheduled agreement service. Conducted thorough evaluation of gas valve assembly, burner components, and pressure/temperature controls. Verified proper operation of gas train components and confirmed all safety mechanisms functioning within manufacturer specifications. Inspected pressure gauge readings and documented system parameters, with temperature and PSI levels showing normal operating ranges. All electrical connections to gas valve assembly examined and found secure. System operating efficiently with no deficiencies noted during inspection.
Niles, IL 60714
Performed routine maintenance on water boiler system including inspection of six-zone copper manifold with ball valves and gate valves, all zones properly tagged and operational. Inspected expansion tank and associated plumbing connections, verified all components functioning within normal parameters with no leaks or deficiencies noted.
Performed routine maintenance on water boiler system including inspection of six-zone copper manifold with ball valves and gate valves, all zones properly tagged and operational. Inspected expansion tank and associated plumbing connections, verified all components functioning within normal parameters with no leaks or deficiencies noted.
Jay L.
Jay L. Checked in
Performed routine maintenance on water boiler system including inspection of six-zone copper manifold with ball valves and gate valves, all zones properly tagged and operational. Inspected expansion tank and associated plumbing connections, verified all components functioning within normal parameters with no leaks or deficiencies noted.
Niles, IL 60714
Conducted site assessment for commercial rooftop unit replacement, evaluating existing 6-ton RTU and documenting current rooftop conditions including membrane type, drainage systems, and equipment access. Photographed unit nameplate specifications and surrounding rooftop infrastructure to provide accurate quote for replacement equipment and installation requirements.
Conducted site assessment for commercial rooftop unit replacement, evaluating existing 6-ton RTU and documenting current rooftop conditions including membrane type, drainage systems, and equipment access. Photographed unit nameplate specifications and surrounding rooftop infrastructure to provide accurate quote for replacement equipment and installation requirements.
John T.
John T. Checked in
Conducted site assessment for commercial rooftop unit replacement, evaluating existing 6-ton RTU and documenting current rooftop conditions including membrane type, drainage systems, and equipment access. Photographed unit nameplate specifications and surrounding rooftop infrastructure to provide accurate quote for replacement equipment and installation requirements.
Niles, IL 60714
Responded to emergency no-cool call on seven-year-old air conditioning system. Performed diagnostic testing using digital multimeter to check electrical components and control board functionality. Upon inspection, identified failed control board with visible component damage; tested voltage readings at multiple connection points to confirm board failure as root cause of system shutdown. Replaced defective circuit board, verified all electrical connections, and successfully restored cooling operation to the system.
Responded to emergency no-cool call on seven-year-old air conditioning system. Performed diagnostic testing using digital multimeter to check electrical components and control board functionality. Upon inspection, identified failed control board with visible component damage; tested voltage readings at multiple connection points to confirm board failure as root cause of system shutdown. Replaced defective circuit board, verified all electrical connections, and successfully restored cooling operation to the system.
Matt B.
Matt B. Checked in
Responded to emergency no-cool call on seven-year-old air conditioning system. Performed diagnostic testing using digital multimeter to check electrical components and control board functionality. Upon inspection, identified failed control board with visible component damage; tested voltage readings at multiple connection points to confirm board failure as root cause of system shutdown. Replaced defective circuit board, verified all electrical connections, and successfully restored cooling operation to the system.
Niles, IL 60714
Responded to callback for plenum insulation near humidifier installation. Upon arrival, accessed attic space and located HVAC air handler and associated ductwork. Applied proper insulation to exposed plenum section adjacent to humidifier connection point to prevent condensation issues and improve system efficiency. Verified all ductwork connections remained secure and properly sealed. Documented completed work with photographs showing insulated plenum and surrounding HVAC components.
Responded to callback for plenum insulation near humidifier installation. Upon arrival, accessed attic space and located HVAC air handler and associated ductwork. Applied proper insulation to exposed plenum section adjacent to humidifier connection point to prevent condensation issues and improve system efficiency. Verified all ductwork connections remained secure and properly sealed. Documented completed work with photographs showing insulated plenum and surrounding HVAC components.
Andy A.
Andy A. Checked in
Responded to callback for plenum insulation near humidifier installation. Upon arrival, accessed attic space and located HVAC air handler and associated ductwork. Applied proper insulation to exposed plenum section adjacent to humidifier connection point to prevent condensation issues and improve system efficiency. Verified all ductwork connections remained secure and properly sealed. Documented completed work with photographs showing insulated plenum and surrounding HVAC components.
Niles, IL 60714
Responded to call back for recently installed air conditioning system reported as non-operational. Upon arrival, performed comprehensive system inspection including attic-mounted ductwork and refrigerant line installations. Inspected foam pipe insulation on refrigerant lines, noting deterioration and potential gaps in coverage that could affect system efficiency. Examined flexible ductwork connections and verified proper sealing at junction points. Checked PVC condensate drain lines for proper pitch and secure connections. Documented existing conditions with photographs showing ductwork configuration, insulation condition, and plumbing installations. System components appeared properly installed with ductwork securely fastened and insulation materials in place, though some insulation showed signs of wear. Verified all mechanical connections in attic space were accessible and properly supported. Rescheduled follow-up appointment to complete diagnostic testing and address any operational
Responded to call back for recently installed air conditioning system reported as non-operational. Upon arrival, performed comprehensive system inspection including attic-mounted ductwork and refrigerant line installations. Inspected foam pipe insulation on refrigerant lines, noting deterioration and potential gaps in coverage that could affect system efficiency. Examined flexible ductwork connections and verified proper sealing at junction points. Checked PVC condensate drain lines for proper pitch and secure connections. Documented existing conditions with photographs showing ductwork configuration, insulation condition, and plumbing installations. System components appeared properly installed with ductwork securely fastened and insulation materials in place, though some insulation showed signs of wear. Verified all mechanical connections in attic space were accessible and properly supported. Rescheduled follow-up appointment to complete diagnostic testing and address any operational
Sam A.
Sam A. Checked in
Responded to call back for recently installed air conditioning system reported as non-operational. Upon arrival, performed comprehensive system inspection including attic-mounted ductwork and refrigerant line installations. Inspected foam pipe insulation on refrigerant lines, noting deterioration and potential gaps in coverage that could affect system efficiency. Examined flexible ductwork connections and verified proper sealing at junction points. Checked PVC condensate drain lines for proper pitch and secure connections. Documented existing conditions with photographs showing ductwork configuration, insulation condition, and plumbing installations. System components appeared properly installed with ductwork securely fastened and insulation materials in place, though some insulation showed signs of wear. Verified all mechanical connections in attic space were accessible and properly supported. Rescheduled follow-up appointment to complete diagnostic testing and address any operational
Niles, IL 60714
Returned to complete previously scheduled repair work on residential HVAC system. Successfully removed and replaced the defective fan blower wheel to restore proper airflow and system operation. Additionally, installed customer-supplied humidifier unit, integrating it with the existing heating system. All electrical connections were properly secured and tested. System was powered up and cycled through full operation to verify proper function of both the new blower wheel and humidifier installation. Unit is operating within normal parameters with no abnormal sounds or vibrations detected.
Returned to complete previously scheduled repair work on residential HVAC system. Successfully removed and replaced the defective fan blower wheel to restore proper airflow and system operation. Additionally, installed customer-supplied humidifier unit, integrating it with the existing heating system. All electrical connections were properly secured and tested. System was powered up and cycled through full operation to verify proper function of both the new blower wheel and humidifier installation. Unit is operating within normal parameters with no abnormal sounds or vibrations detected.
Matt B.
Matt B. Checked in
Returned to complete previously scheduled repair work on residential HVAC system. Successfully removed and replaced the defective fan blower wheel to restore proper airflow and system operation. Additionally, installed customer-supplied humidifier unit, integrating it with the existing heating system. All electrical connections were properly secured and tested. System was powered up and cycled through full operation to verify proper function of both the new blower wheel and humidifier installation. Unit is operating within normal parameters with no abnormal sounds or vibrations detected.
Niles, IL 60714
Provided comprehensive estimate for complete air conditioning system replacement after diagnosing an oversized unit causing recurring indoor coil freeze-ups due to insufficient airflow through the ductwork. Consulted with supervisor to confirm assessment that the current system's excessive capacity cannot be remedied through fan speed adjustments alone. Explained to homeowner that the existing system's oversizing combined with inadequate air movement through the duct system creates conditions where the evaporator coil temperature drops below freezing, and while a freeze prevention sensor was previously installed to keep the blower running for circulation, this is only a temporary mitigation rather than a permanent solution requiring proper equipment sizing and airflow correction.
Provided comprehensive estimate for complete air conditioning system replacement after diagnosing an oversized unit causing recurring indoor coil freeze-ups due to insufficient airflow through the ductwork. Consulted with supervisor to confirm assessment that the current system's excessive capacity cannot be remedied through fan speed adjustments alone. Explained to homeowner that the existing system's oversizing combined with inadequate air movement through the duct system creates conditions where the evaporator coil temperature drops below freezing, and while a freeze prevention sensor was previously installed to keep the blower running for circulation, this is only a temporary mitigation rather than a permanent solution requiring proper equipment sizing and airflow correction.
Tyler B.
Tyler B. Checked in
Provided comprehensive estimate for complete air conditioning system replacement after diagnosing an oversized unit causing recurring indoor coil freeze-ups due to insufficient airflow through the ductwork. Consulted with supervisor to confirm assessment that the current system's excessive capacity cannot be remedied through fan speed adjustments alone. Explained to homeowner that the existing system's oversizing combined with inadequate air movement through the duct system creates conditions where the evaporator coil temperature drops below freezing, and while a freeze prevention sensor was previously installed to keep the blower running for circulation, this is only a temporary mitigation rather than a permanent solution requiring proper equipment sizing and airflow correction.
Niles, IL 60714
Responded to no cooling complaint on 9-year-old air conditioning system. Upon inspection, found unit was oversized for the home and had a freeze protection sensor previously installed by another technician that was cycling the compressor off while keeping the blower running continuously. This configuration prevented proper cooling, resulting in first floor temperatures exceeding 80 degrees while basement remained in upper 60s, indicating poor air distribution and inadequate dehumidification. Examined evaporator coil area and drain pan, noting evidence of previous moisture accumulation and mineral deposits consistent with freeze-up history. Documented existing equipment configuration and sensor installation. Discussed system sizing concerns and recommended solutions including potential replacement with properly sized equipment, improved airflow management, and thermostat adjustments to address short-cycling and freeze-up issues inherent to oversized systems.
Responded to no cooling complaint on 9-year-old air conditioning system. Upon inspection, found unit was oversized for the home and had a freeze protection sensor previously installed by another technician that was cycling the compressor off while keeping the blower running continuously. This configuration prevented proper cooling, resulting in first floor temperatures exceeding 80 degrees while basement remained in upper 60s, indicating poor air distribution and inadequate dehumidification. Examined evaporator coil area and drain pan, noting evidence of previous moisture accumulation and mineral deposits consistent with freeze-up history. Documented existing equipment configuration and sensor installation. Discussed system sizing concerns and recommended solutions including potential replacement with properly sized equipment, improved airflow management, and thermostat adjustments to address short-cycling and freeze-up issues inherent to oversized systems.
Ernesto G.
Ernesto G. Checked in
Responded to no cooling complaint on 9-year-old air conditioning system. Upon inspection, found unit was oversized for the home and had a freeze protection sensor previously installed by another technician that was cycling the compressor off while keeping the blower running continuously. This configuration prevented proper cooling, resulting in first floor temperatures exceeding 80 degrees while basement remained in upper 60s, indicating poor air distribution and inadequate dehumidification. Examined evaporator coil area and drain pan, noting evidence of previous moisture accumulation and mineral deposits consistent with freeze-up history. Documented existing equipment configuration and sensor installation. Discussed system sizing concerns and recommended solutions including potential replacement with properly sized equipment, improved airflow management, and thermostat adjustments to address short-cycling and freeze-up issues inherent to oversized systems.
Niles, IL 60714
Completed full replacement of two residential HVAC systems, including one unit installed in the attic and one outdoor condenser unit positioned on a concrete pad against the building exterior. The outdoor unit was properly mounted with refrigerant lines and electrical conduit routed along the brick wall, with disconnect box installed for code compliance. New Honeywell Home digital thermostat was installed and programmed to control the system. All equipment was tested for proper operation, refrigerant charge verified, and electrical connections confirmed secure. Job site was left clean and all debris removed.
Completed full replacement of two residential HVAC systems, including one unit installed in the attic and one outdoor condenser unit positioned on a concrete pad against the building exterior. The outdoor unit was properly mounted with refrigerant lines and electrical conduit routed along the brick wall, with disconnect box installed for code compliance. New Honeywell Home digital thermostat was installed and programmed to control the system. All equipment was tested for proper operation, refrigerant charge verified, and electrical connections confirmed secure. Job site was left clean and all debris removed.
Andy A.
Andy A. Checked in
Completed full replacement of two residential HVAC systems, including one unit installed in the attic and one outdoor condenser unit positioned on a concrete pad against the building exterior. The outdoor unit was properly mounted with refrigerant lines and electrical conduit routed along the brick wall, with disconnect box installed for code compliance. New Honeywell Home digital thermostat was installed and programmed to control the system. All equipment was tested for proper operation, refrigerant charge verified, and electrical connections confirmed secure. Job site was left clean and all debris removed.
Niles, IL 60714
Completed HVAC maintenance agreement service on cooling system. Performed diagnostic testing including electrical measurements using clamp meter on internal components, reading 1290 on display. Accessed air handler unit to inspect control board, wiring connections, and internal components. Verified thermostat operation on Honeywell digital unit showing system cooling properly with indoor temperature at 76° and outdoor temperature at 97°. Provided customer with information regarding humidifier installation options for future consideration.
Completed HVAC maintenance agreement service on cooling system. Performed diagnostic testing including electrical measurements using clamp meter on internal components, reading 1290 on display. Accessed air handler unit to inspect control board, wiring connections, and internal components. Verified thermostat operation on Honeywell digital unit showing system cooling properly with indoor temperature at 76° and outdoor temperature at 97°. Provided customer with information regarding humidifier installation options for future consideration.
Matt B.
Matt B. Checked in
Completed HVAC maintenance agreement service on cooling system. Performed diagnostic testing including electrical measurements using clamp meter on internal components, reading 1290 on display. Accessed air handler unit to inspect control board, wiring connections, and internal components. Verified thermostat operation on Honeywell digital unit showing system cooling properly with indoor temperature at 76° and outdoor temperature at 97°. Provided customer with information regarding humidifier installation options for future consideration.
Niles, IL 60714
Responded to no cooling complaint on residential HVAC system less than 10 years old. Upon arrival, accessed indoor air handler unit and inspected internal components including blower motor, electrical connections, and control boards. Proceeded to outdoor condenser unit where compressor was found to be inoperative. Removed failed compressor from outdoor unit and staged replacement component on-site. Documented existing refrigerant line connections and electrical wiring configuration. System required compressor replacement to restore cooling functionality.
Responded to no cooling complaint on residential HVAC system less than 10 years old. Upon arrival, accessed indoor air handler unit and inspected internal components including blower motor, electrical connections, and control boards. Proceeded to outdoor condenser unit where compressor was found to be inoperative. Removed failed compressor from outdoor unit and staged replacement component on-site. Documented existing refrigerant line connections and electrical wiring configuration. System required compressor replacement to restore cooling functionality.
Jay L.
Jay L. Checked in
Responded to no cooling complaint on residential HVAC system less than 10 years old. Upon arrival, accessed indoor air handler unit and inspected internal components including blower motor, electrical connections, and control boards. Proceeded to outdoor condenser unit where compressor was found to be inoperative. Removed failed compressor from outdoor unit and staged replacement component on-site. Documented existing refrigerant line connections and electrical wiring configuration. System required compressor replacement to restore cooling functionality.
Niles, IL 60714
Responded to commercial no-cooling call and accessed rooftop HVAC unit using 28-foot extension ladder. Upon inspection, diagnosed and resolved cooling system malfunction, restoring proper operation to the unit. Equipment tested and confirmed operational before departure.
Responded to commercial no-cooling call and accessed rooftop HVAC unit using 28-foot extension ladder. Upon inspection, diagnosed and resolved cooling system malfunction, restoring proper operation to the unit. Equipment tested and confirmed operational before departure.
Gabe G.
Gabe G. Checked in
Responded to commercial no-cooling call and accessed rooftop HVAC unit using 28-foot extension ladder. Upon inspection, diagnosed and resolved cooling system malfunction, restoring proper operation to the unit. Equipment tested and confirmed operational before departure.
Niles, IL 60714
Responded to no cooling call and arrived on site to diagnose air conditioning system that was completely off. Performed system diagnostics using digital measurement tools and inspected refrigerant lines, recording a temperature reading of 57.3 degrees at the copper line. Documented equipment condition with photos showing HVAC unit with diagnostic gauge displaying indicator lights and overall system status for further assessment and repair recommendations.
Responded to no cooling call and arrived on site to diagnose air conditioning system that was completely off. Performed system diagnostics using digital measurement tools and inspected refrigerant lines, recording a temperature reading of 57.3 degrees at the copper line. Documented equipment condition with photos showing HVAC unit with diagnostic gauge displaying indicator lights and overall system status for further assessment and repair recommendations.
Sam A.
Sam A. Checked in
Responded to no cooling call and arrived on site to diagnose air conditioning system that was completely off. Performed system diagnostics using digital measurement tools and inspected refrigerant lines, recording a temperature reading of 57.3 degrees at the copper line. Documented equipment condition with photos showing HVAC unit with diagnostic gauge displaying indicator lights and overall system status for further assessment and repair recommendations.
Niles, IL 60714
Completed preventive maintenance on outdoor air conditioning unit per maintenance agreement terms. Inspected control board, electrical connections, and wiring harness; verified all terminal connections secure and system operational. Accessed unit through rear entrance per customer request due to front doorbell malfunction.
Completed preventive maintenance on outdoor air conditioning unit per maintenance agreement terms. Inspected control board, electrical connections, and wiring harness; verified all terminal connections secure and system operational. Accessed unit through rear entrance per customer request due to front doorbell malfunction.
Izzy G.
Izzy G. Checked in
Completed preventive maintenance on outdoor air conditioning unit per maintenance agreement terms. Inspected control board, electrical connections, and wiring harness; verified all terminal connections secure and system operational. Accessed unit through rear entrance per customer request due to front doorbell malfunction.
Niles, IL 60714

Client Testimonials

Read the opinions of our satisfied customers.

5 stars

This was my first time as a Deljo customer, and I was very pleased. My technician, Giovanni, was very thorough and diligent. He serviced my furnace and identified a faulty sensor that was causing the unit to shut itself down. Deljo ordered the part, and Giovanni replaced it a few days later. Overall, the team at Deljo was great. The dispatcher kept me informed about Giovanni’s arrival time, and the supervisor assisted Giovanni when he was diagnosing the problem with the furnace. I highly recommend Deljo.

Paul D. 10/15/2026

5 stars

I’ve used Deljo for over 10 years now and they always do a good job. Izzy was the technician for this visit and he did an excellent job with my winter maintenance on my multiple units in the household. He also addressed an issue while cleaning the furnace blower wheel. His communication was clear and concise with what he planned to do to address the issue quickly. He was confident and I had 0 concerns or questions. Great job Izzy!

Jeff S. 10/14/2026

5 stars

Paul was great! Arrived on time and completed maintenance on my humidifier, tankless water heater, and two furnaces. All work was performed under my Gold Star maintenance program, so all maintenance charges were covered. Paul did provide a few proposals for additional services on furnace & tankless water heater, but those were emailed to me for further consideration. Paul was friendly, knowledgeable, and answered all my questions.

Jack N. 10/12/2026

5 stars

Gabe did an excellent job with our annual service visit. He arrived in the early part of our service window, was friendly and knowledgeable, and got the work done in a very reasonable amount of time. I have great confidence in Deljo, and am a long-time customer.

Ruth C. 10/9/2026

5 stars

I’ve been using Deljo for 20 years for HVAC but now venture into enlisting their plumbing services. Bashar was very courteous, efficient & informative, and I’d definitely request him again for the next plumbing job. Great experience!

Christopher R. 10/2/2026

5 stars

Working with Deljo is always a good experience, and today’s appointment with Izzy was no different. He was able to come early which actually worked better with our schedules, but called me ahead of time to make sure that was okay. He was friendly and knowledgeable when he explained the work he had done during his visit and our options for fixes. He was also able to schedule a quote appointment for us while he was still here. We would highly recommend working with Izzy and the Deljo team!

Lauren H.  9/25/2026

5 stars

Drew performed the seasonal maintenance on my AC. It needed some repairs and updates and he was able to fix everything at the same appointment. He also noticed issues with the hot water heater and we were able to get ahead of that, as well.

Emily W. 9/11/2026

5 stars

I would leave six out of five stars if I could! My technician Jorge went above and beyond on his service. There was buildup in the rental property’s toilet from the previous tenant. One maintenance person did a surface level job of cleaning but did not fully remove the obstruction. Jorge went above and beyond and came to a solution and even explained the perpetual problems older toilet models can cause. Moving forward with this insight, I can perform my own upkeep the previous tenant did not. Thank you kindly!

Kayla K.  9/15/2026

5 stars

We just had our new boiler installed by Jonathan and Carlos. First rate work! They arrived on time, removed the old boiler, installed the new unit, and explained the features. Both guys were pleasant. Bring on the cold this winter! We are ready thanks to the team from Deljo.

Edward B.  6/26/2026

5 stars

Deljo’s heating and cooling team was awesome to work with. As a first-time homeowner, I really appreciated how clearly they explained everything and answered all my questions. From the quote to the install and follow-up, the service was top-notch. Highly recommend!

Lindsey A. Chicago, IL

5 stars

Matt did an amazing job. He serviced our home and our rental property. He gave us options to help our systems run more efficiently. He also told us about Deljo’s new plumbing inspection which was very affordable. He is great!

Jordan R. Chicago, IL

5 stars

We had a problem with our Humidifier and called Deljo. Jesus came out to help and was amazing. He was extremely knowledgeable, detail oriented, and super courteous. Amazing customer experience!

Jeff C. Chicago, IL

5 stars

Jordan and Jesus were extremely helpful and knowledgeable! We would 100% work with them and have them back. They were both very professional and efficiently fixed our heating system.

Emily L. Chicago, IL

5 stars

Shout out to Ernesto for coming out and servicing our furnace and air con. Deljo provides a great service and glad to trust them with our HVAC for our small business.

Lauren H. Chicago, IL

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