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HVAC Services for Heating and Cooling – Oak Park, IL

Any time your air conditioner or heater stops working, life is interrupted. Not only is it uncomfortable to be too hot or too cold in your home, but it can also be dangerous. It’s important to have someone you know you can trust to promptly repair your HVAC in Oak Park, IL.

Deljo Heating and Cooling has been servicing the greater Chicago area for over a decade and has earned the trust of countless homeowners. We are proud of the reputation we have built, and we intend to continue the service we are known for.

HVAC Services in Oak Park, IL

HVAC Maintenance Services

Regular maintenance of your heating and cooling system is essential for continued efficiency and longevity. We recommend biannual service during spring and fall to ensure your HVAC system will work reliably throughout extreme high and low temperatures. Our HVAC technicians will inspect, test, and clean your system, replacing worn parts. We will make sure everything is working efficiently before leaving your home.

HVAC Repair Services

Whether you need AC repair, furnace repair, or anything in between, our technicians have the experience and knowledge to diagnose and repair any heating or cooling system. We arrive promptly for your appointment, remain professional and respectful of your time and home, and fully address all questions and concerns you may have.

If for some reason part of your HVAC system is beyond repair, we will discuss your needs and together decide how to proceed.

HVAC system repair in Oak Park, IL

Air Conditioning and Furnace Installation

Dejo Heating and Cooling can install any type of boiler, furnace, heat pump, AC unit, or dual system you may need. If you are ready to upgrade but are unsure what system is best for your home, we would be happy to discuss your needs and budget and make a professional recommendation you feel confident with.

Our team works quickly to ensure your timely return to comfort. Our goal is your satisfaction, and we take that very seriously.

HVAC Services in Oak Park, IL

During the century Deljo Heating and Cooling has served the greater Chicago area, we have developed a high standard of excellence that’s promised to every customer, every time we visit.

We truly care about our neighbors, and we want you to be comfortable and safe in your home. That’s why we also offer emergency repair service, no matter what time of day or night. Experience the Deljo Difference yourself, and rely on us for all your HVAC service needs.

Recent Jobs and Reviews in Oak Park, IL

Job Locations and Reviews

Responded to no cooling complaint on 1-year-old residential air conditioning system. Replaced failed fuse in condensing unit to restore power to compressor circuit. Installed additional ductwork run in attic space using rigid galvanized metal duct sections with insulated flex connections. Measured and fitted duct collar transition at branch takeoff point to ensure proper airflow distribution. Secured all ductwork connections and verified system operation with adequate cooling performance restored.
Responded to no cooling complaint on 1-year-old residential air conditioning system. Replaced failed fuse in condensing unit to restore power to compressor circuit. Installed additional ductwork run in attic space using rigid galvanized metal duct sections with insulated flex connections. Measured and fitted duct collar transition at branch takeoff point to ensure proper airflow distribution. Secured all ductwork connections and verified system operation with adequate cooling performance restored.
Izzy G.
Izzy G. Checked in
Responded to no cooling complaint on 1-year-old residential air conditioning system. Replaced failed fuse in condensing unit to restore power to compressor circuit. Installed additional ductwork run in attic space using rigid galvanized metal duct sections with insulated flex connections. Measured and fitted duct collar transition at branch takeoff point to ensure proper airflow distribution. Secured all ductwork connections and verified system operation with adequate cooling performance restored.
Oak Park, IL 60304
Responded to service call for second opinion on 20-year-old residential air conditioning unit with no cooling condition and suspected refrigerant leak. Upon arrival, performed comprehensive system evaluation including visual inspection of outdoor condensing unit, electrical components, and refrigerant circuit. Connected manifold gauge set to service ports and confirmed low refrigerant charge with abnormal pressure readings on both high and low sides, indicating significant refrigerant loss. Inspected capacitor, contactor, and wiring harness for proper operation and connections. Verified compressor electrical components and control circuits functioning within specifications. Documented system condition with photographs showing pressure gauge readings and internal electrical compartment including Turbo200 capacitor and associated wiring. Confirmed previous diagnosis of refrigerant leak and advised customer that due to advanced age of equipment (20+ years), locating and repairing leak fol
Responded to service call for second opinion on 20-year-old residential air conditioning unit with no cooling condition and suspected refrigerant leak. Upon arrival, performed comprehensive system evaluation including visual inspection of outdoor condensing unit, electrical components, and refrigerant circuit. Connected manifold gauge set to service ports and confirmed low refrigerant charge with abnormal pressure readings on both high and low sides, indicating significant refrigerant loss. Inspected capacitor, contactor, and wiring harness for proper operation and connections. Verified compressor electrical components and control circuits functioning within specifications. Documented system condition with photographs showing pressure gauge readings and internal electrical compartment including Turbo200 capacitor and associated wiring. Confirmed previous diagnosis of refrigerant leak and advised customer that due to advanced age of equipment (20+ years), locating and repairing leak fol
Jay L.
Jay L. Checked in
Responded to service call for second opinion on 20-year-old residential air conditioning unit with no cooling condition and suspected refrigerant leak. Upon arrival, performed comprehensive system evaluation including visual inspection of outdoor condensing unit, electrical components, and refrigerant circuit. Connected manifold gauge set to service ports and confirmed low refrigerant charge with abnormal pressure readings on both high and low sides, indicating significant refrigerant loss. Inspected capacitor, contactor, and wiring harness for proper operation and connections. Verified compressor electrical components and control circuits functioning within specifications. Documented system condition with photographs showing pressure gauge readings and internal electrical compartment including Turbo200 capacitor and associated wiring. Confirmed previous diagnosis of refrigerant leak and advised customer that due to advanced age of equipment (20+ years), locating and repairing leak fol
Oak Park, IL 60302
Responded to callback for recurring frozen evaporator coil on recently installed HVAC system. Performed comprehensive diagnostic testing using manifold gauges and digital thermometer to verify refrigerant charge levels, superheat, and subcooling measurements. Identified airflow restriction issues and inspected line set insulation integrity in crawl space area. Corrected system deficiencies, verified proper operation, and restored cooling functionality.
Responded to callback for recurring frozen evaporator coil on recently installed HVAC system. Performed comprehensive diagnostic testing using manifold gauges and digital thermometer to verify refrigerant charge levels, superheat, and subcooling measurements. Identified airflow restriction issues and inspected line set insulation integrity in crawl space area. Corrected system deficiencies, verified proper operation, and restored cooling functionality.
Jay L.
Jay L. Checked in
Responded to callback for recurring frozen evaporator coil on recently installed HVAC system. Performed comprehensive diagnostic testing using manifold gauges and digital thermometer to verify refrigerant charge levels, superheat, and subcooling measurements. Identified airflow restriction issues and inspected line set insulation integrity in crawl space area. Corrected system deficiencies, verified proper operation, and restored cooling functionality.
Oak Park, IL 60302
Technician completed an HVAC estimate for air conditioning system replacement on a 2017 first-floor unit with easy accessibility. The existing condenser unit showed signs of age and weathering, located on a concrete pad along the exterior wall with standard refrigerant line connections. Assessment included evaluation of repair versus replacement options for the aging system.
Technician completed an HVAC estimate for air conditioning system replacement on a 2017 first-floor unit with easy accessibility. The existing condenser unit showed signs of age and weathering, located on a concrete pad along the exterior wall with standard refrigerant line connections. Assessment included evaluation of repair versus replacement options for the aging system.
Jim C.
Jim C. Checked in
Technician completed an HVAC estimate for air conditioning system replacement on a 2017 first-floor unit with easy accessibility. The existing condenser unit showed signs of age and weathering, located on a concrete pad along the exterior wall with standard refrigerant line connections. Assessment included evaluation of repair versus replacement options for the aging system.
Oak Park, IL 60302
Oak Park, IL - Completed return visit to perform UV leak test on outdoor refrigerant line set. Inspection revealed significant corrosion and oxidation on exposed copper piping with visible moisture accumulation on pipe insulation and fittings. Documented conditions with photographs showing corroded copper with black discoloration and water droplets throughout the system, indicating potential leak source requiring further evaluation or repair.
Izzy G.
Izzy G. Checked in
Completed return visit to perform UV leak test on outdoor refrigerant line set. Inspection revealed significant corrosion and oxidation on exposed copper piping with visible moisture accumulation on pipe insulation and fittings. Documented conditions with photographs showing corroded copper with black discoloration and water droplets throughout the system, indicating potential leak source requiring further evaluation or repair.
Oak Park, IL 60302
Completed courtesy check on Bosch air conditioning system and air handler per maintenance agreement terms. Inspected outdoor condenser unit, indoor air handler, and verified thermostat operation. All components found operating within normal parameters with no immediate service needs identified at time of visit.
Completed courtesy check on Bosch air conditioning system and air handler per maintenance agreement terms. Inspected outdoor condenser unit, indoor air handler, and verified thermostat operation. All components found operating within normal parameters with no immediate service needs identified at time of visit.
Giovanni M.
Giovanni M. Checked in
Completed courtesy check on Bosch air conditioning system and air handler per maintenance agreement terms. Inspected outdoor condenser unit, indoor air handler, and verified thermostat operation. All components found operating within normal parameters with no immediate service needs identified at time of visit.
Oak Park, IL 60302
Completed maintenance agreement transfer for air conditioning system relocated from previous address. Documented existing equipment installation including ductwork in basement/crawl space area and outdoor condensing unit with capacitor and electrical connections. Photos captured for equipment verification and system registration update purposes.
Completed maintenance agreement transfer for air conditioning system relocated from previous address. Documented existing equipment installation including ductwork in basement/crawl space area and outdoor condensing unit with capacitor and electrical connections. Photos captured for equipment verification and system registration update purposes.
Giovanni M.
Giovanni M. Checked in
Completed maintenance agreement transfer for air conditioning system relocated from previous address. Documented existing equipment installation including ductwork in basement/crawl space area and outdoor condensing unit with capacitor and electrical connections. Photos captured for equipment verification and system registration update purposes.
Oak Park, IL 60304
Completed preventive maintenance agreement service on residential HVAC system. Replaced two air conditioning system filters with new 20x25x1 and 16x25x1 filters as specified. Inspected electrical components including dual-run capacitor rated at 45/5µF 440VAC and contactor assembly, confirming proper connections and secure wire terminations. Verified all mechanical and plumbing components in utility room, documented system condition with photographic evidence showing proper installation and component labeling.
Completed preventive maintenance agreement service on residential HVAC system. Replaced two air conditioning system filters with new 20x25x1 and 16x25x1 filters as specified. Inspected electrical components including dual-run capacitor rated at 45/5µF 440VAC and contactor assembly, confirming proper connections and secure wire terminations. Verified all mechanical and plumbing components in utility room, documented system condition with photographic evidence showing proper installation and component labeling.
Angel C.
Angel C. Checked in
Completed preventive maintenance agreement service on residential HVAC system. Replaced two air conditioning system filters with new 20x25x1 and 16x25x1 filters as specified. Inspected electrical components including dual-run capacitor rated at 45/5µF 440VAC and contactor assembly, confirming proper connections and secure wire terminations. Verified all mechanical and plumbing components in utility room, documented system condition with photographic evidence showing proper installation and component labeling.
Oak Park, IL 60302
Completed full air conditioning system replacement including outdoor condenser unit and indoor evaporator coil. Installed new condenser on existing concrete pad in exterior location, ensuring proper clearances and secure mounting. Replaced indoor coil component to match new system specifications. Connected refrigerant lines, verified electrical connections, and confirmed thermostat communication with new equipment. System tested and operating within manufacturer specifications at completion.
Completed full air conditioning system replacement including outdoor condenser unit and indoor evaporator coil. Installed new condenser on existing concrete pad in exterior location, ensuring proper clearances and secure mounting. Replaced indoor coil component to match new system specifications. Connected refrigerant lines, verified electrical connections, and confirmed thermostat communication with new equipment. System tested and operating within manufacturer specifications at completion.
Richard G.
Richard G. Checked in
Completed full air conditioning system replacement including outdoor condenser unit and indoor evaporator coil. Installed new condenser on existing concrete pad in exterior location, ensuring proper clearances and secure mounting. Replaced indoor coil component to match new system specifications. Connected refrigerant lines, verified electrical connections, and confirmed thermostat communication with new equipment. System tested and operating within manufacturer specifications at completion.
Oak Park, IL 60302
Completed cooling cycle air conditioning general service maintenance per agreement terms. Verified thermostat operation displaying 89°F and proper communication with HVAC system. Inspected outdoor condensing unit with cover removed, checked all electrical connections, capacitor condition, and compressor motor components. All wiring connections secure with proper color coding intact, capacitor tested within specifications, and unit operating normally with no deficiencies noted.
Completed cooling cycle air conditioning general service maintenance per agreement terms. Verified thermostat operation displaying 89°F and proper communication with HVAC system. Inspected outdoor condensing unit with cover removed, checked all electrical connections, capacitor condition, and compressor motor components. All wiring connections secure with proper color coding intact, capacitor tested within specifications, and unit operating normally with no deficiencies noted.
Paul M.
Paul M. Checked in
Completed cooling cycle air conditioning general service maintenance per agreement terms. Verified thermostat operation displaying 89°F and proper communication with HVAC system. Inspected outdoor condensing unit with cover removed, checked all electrical connections, capacitor condition, and compressor motor components. All wiring connections secure with proper color coding intact, capacitor tested within specifications, and unit operating normally with no deficiencies noted.
Oak Park, IL 60304
Conducted comprehensive assessment of aging residential HVAC system for replacement estimate. Evaluated existing outdoor condensing unit and Space Pak high-velocity air conditioning system, both exceeding 15 years of service life. Inspected condenser unit exterior condition, refrigerant line set routing, and electrical connections. Documented current thermostat configuration showing Braeburn digital control unit. Photographed equipment placement, copper line set condition showing oxidation typical of aged installations, and gravel pad foundation supporting outdoor unit. Provided property owner with detailed replacement options for complete system upgrade including new condensing unit and Space Pak equipment to restore efficient climate control operation.
Conducted comprehensive assessment of aging residential HVAC system for replacement estimate. Evaluated existing outdoor condensing unit and Space Pak high-velocity air conditioning system, both exceeding 15 years of service life. Inspected condenser unit exterior condition, refrigerant line set routing, and electrical connections. Documented current thermostat configuration showing Braeburn digital control unit. Photographed equipment placement, copper line set condition showing oxidation typical of aged installations, and gravel pad foundation supporting outdoor unit. Provided property owner with detailed replacement options for complete system upgrade including new condensing unit and Space Pak equipment to restore efficient climate control operation.
Tyler B.
Tyler B. Checked in
Conducted comprehensive assessment of aging residential HVAC system for replacement estimate. Evaluated existing outdoor condensing unit and Space Pak high-velocity air conditioning system, both exceeding 15 years of service life. Inspected condenser unit exterior condition, refrigerant line set routing, and electrical connections. Documented current thermostat configuration showing Braeburn digital control unit. Photographed equipment placement, copper line set condition showing oxidation typical of aged installations, and gravel pad foundation supporting outdoor unit. Provided property owner with detailed replacement options for complete system upgrade including new condensing unit and Space Pak equipment to restore efficient climate control operation.
Oak Park, IL 60302
Conducted onsite inspection of existing attic-mounted HVAC system to assess replacement requirements. Evaluated current air handler unit, flexible ductwork configuration, and associated drainage systems including PVC condensate lines. Documented equipment condition, noting aged installation with disturbed insulation and existing duct connections. Photographed attic installation layout including equipment positioning, ductwork routing, electrical connections, and clearance requirements for replacement planning. Provided comprehensive free estimate for complete AC unit replacement based on inspection findings.
Conducted onsite inspection of existing attic-mounted HVAC system to assess replacement requirements. Evaluated current air handler unit, flexible ductwork configuration, and associated drainage systems including PVC condensate lines. Documented equipment condition, noting aged installation with disturbed insulation and existing duct connections. Photographed attic installation layout including equipment positioning, ductwork routing, electrical connections, and clearance requirements for replacement planning. Provided comprehensive free estimate for complete AC unit replacement based on inspection findings.
Tyler B.
Tyler B. Checked in
Conducted onsite inspection of existing attic-mounted HVAC system to assess replacement requirements. Evaluated current air handler unit, flexible ductwork configuration, and associated drainage systems including PVC condensate lines. Documented equipment condition, noting aged installation with disturbed insulation and existing duct connections. Photographed attic installation layout including equipment positioning, ductwork routing, electrical connections, and clearance requirements for replacement planning. Provided comprehensive free estimate for complete AC unit replacement based on inspection findings.
Oak Park, IL 60302
Returned to property to complete refrigerant leak search using electronic leak detector on split system air conditioning unit. Accessed outdoor condenser unit and indoor evaporator coil compartment to systematically test all refrigerant lines, fittings, and brazed connections. Utilized recovery equipment and manifold gauges to isolate system components during leak detection process. Inspected all accessible copper refrigerant lines, service valves, and brass fittings for potential leak points while monitoring detector response.
Returned to property to complete refrigerant leak search using electronic leak detector on split system air conditioning unit. Accessed outdoor condenser unit and indoor evaporator coil compartment to systematically test all refrigerant lines, fittings, and brazed connections. Utilized recovery equipment and manifold gauges to isolate system components during leak detection process. Inspected all accessible copper refrigerant lines, service valves, and brass fittings for potential leak points while monitoring detector response.
Izzy G.
Izzy G. Checked in
Returned to property to complete refrigerant leak search using electronic leak detector on split system air conditioning unit. Accessed outdoor condenser unit and indoor evaporator coil compartment to systematically test all refrigerant lines, fittings, and brazed connections. Utilized recovery equipment and manifold gauges to isolate system components during leak detection process. Inspected all accessible copper refrigerant lines, service valves, and brass fittings for potential leak points while monitoring detector response.
Oak Park, IL 60302
Performed comprehensive cleaning and maintenance on two air conditioning systems and air handlers following construction activity that resulted in heavy dust accumulation throughout the HVAC equipment. Replaced two 16x20x1 disposable filters and cleaned one washable filter, all of which showed significant construction debris buildup. Conducted thorough inspection of attic-mounted Trane air handler unit, removing accumulated dust and particulate matter from exterior surfaces and accessible components. 

Additionally, inspected boiler and radiator heating system in response to recent radiator installation work and customer concern regarding potential water leak near floor level. Evaluated piping connections, radiator installations, and surrounding areas to determine source of moisture and assess whether discharge was intentional drainage by design or unintended leak requiring repair. Documented equipment conditions through photography for service records.
Performed comprehensive cleaning and maintenance on two air conditioning systems and air handlers following construction activity that resulted in heavy dust accumulation throughout the HVAC equipment. Replaced two 16x20x1 disposable filters and cleaned one washable filter, all of which showed significant construction debris buildup. Conducted thorough inspection of attic-mounted Trane air handler unit, removing accumulated dust and particulate matter from exterior surfaces and accessible components. 

Additionally, inspected boiler and radiator heating system in response to recent radiator installation work and customer concern regarding potential water leak near floor level. Evaluated piping connections, radiator installations, and surrounding areas to determine source of moisture and assess whether discharge was intentional drainage by design or unintended leak requiring repair. Documented equipment conditions through photography for service records.
Gerardo M.
Gerardo M. Checked in
Performed comprehensive cleaning and maintenance on two air conditioning systems and air handlers following construction activity that resulted in heavy dust accumulation throughout the HVAC equipment. Replaced two 16x20x1 disposable filters and cleaned one washable filter, all of which showed significant construction debris buildup. Conducted thorough inspection of attic-mounted Trane air handler unit, removing accumulated dust and particulate matter from exterior surfaces and accessible components. Additionally, inspected boiler and radiator heating system in response to recent radiator installation work and customer concern regarding potential water leak near floor level. Evaluated piping connections, radiator installations, and surrounding areas to determine source of moisture and assess whether discharge was intentional drainage by design or unintended leak requiring repair. Documented equipment conditions through photography for service records.
Oak Park, IL 60302
Responded to no-power issue on recently installed AC unit with thermostat displaying no power. Upon inspection, verified proper installation of evaporator coil, refrigerant lines, and ductwork connections in air handler unit. Traced electrical circuit, identified and resolved power supply issue restoring functionality to thermostat and system operation.
Responded to no-power issue on recently installed AC unit with thermostat displaying no power. Upon inspection, verified proper installation of evaporator coil, refrigerant lines, and ductwork connections in air handler unit. Traced electrical circuit, identified and resolved power supply issue restoring functionality to thermostat and system operation.
Carlos E.
Carlos E. Checked in
Responded to no-power issue on recently installed AC unit with thermostat displaying no power. Upon inspection, verified proper installation of evaporator coil, refrigerant lines, and ductwork connections in air handler unit. Traced electrical circuit, identified and resolved power supply issue restoring functionality to thermostat and system operation.
Oak Park, IL 60302
Completed routine HVAC maintenance agreement service on Carrier split system. Performed comprehensive cleaning and inspection of outdoor condenser unit and indoor air handler. Replaced 20x25x1 air filter at air handler location. Inspected condenser coil fins, verified proper airflow, and checked electrical connections at outdoor unit. Examined control board wiring and electrical components inside air handler cabinet, confirming all connections secure and system operating within normal parameters. Discussed previously recommended thermostat upgrade options with customer who expressed continued interest in replacement.
Completed routine HVAC maintenance agreement service on Carrier split system. Performed comprehensive cleaning and inspection of outdoor condenser unit and indoor air handler. Replaced 20x25x1 air filter at air handler location. Inspected condenser coil fins, verified proper airflow, and checked electrical connections at outdoor unit. Examined control board wiring and electrical components inside air handler cabinet, confirming all connections secure and system operating within normal parameters. Discussed previously recommended thermostat upgrade options with customer who expressed continued interest in replacement.
Joe A.
Joe A. Checked in
Completed routine HVAC maintenance agreement service on Carrier split system. Performed comprehensive cleaning and inspection of outdoor condenser unit and indoor air handler. Replaced 20x25x1 air filter at air handler location. Inspected condenser coil fins, verified proper airflow, and checked electrical connections at outdoor unit. Examined control board wiring and electrical components inside air handler cabinet, confirming all connections secure and system operating within normal parameters. Discussed previously recommended thermostat upgrade options with customer who expressed continued interest in replacement.
Oak Park, IL 60302
Conducted comprehensive assessment of existing HVAC system for heating unit replacement at residential property. Evaluated current Rheem furnace installation located in basement utility area alongside water heater. Performed dimensional measurements of outdoor air conditioning equipment to ensure proper sizing compatibility for new system installation. Documented existing equipment configuration including PVC venting, copper refrigerant lines, and current furnace placement within confined utility space.

Prepared detailed replacement estimate for two heating units with equipment options. Presented GOOD tier Carrier gas furnace option rated at up to 80% nominal AFUE efficiency and BEST tier Carrier gas furnace option also rated at up to 80% nominal AFUE efficiency. Reviewed existing utility room layout constraints including carpeted flooring, adjacent cabinetry, and current piping configurations to determine installation requirements. Assessed venting pathways and utility connections fo
Conducted comprehensive assessment of existing HVAC system for heating unit replacement at residential property. Evaluated current Rheem furnace installation located in basement utility area alongside water heater. Performed dimensional measurements of outdoor air conditioning equipment to ensure proper sizing compatibility for new system installation. Documented existing equipment configuration including PVC venting, copper refrigerant lines, and current furnace placement within confined utility space.

Prepared detailed replacement estimate for two heating units with equipment options. Presented GOOD tier Carrier gas furnace option rated at up to 80% nominal AFUE efficiency and BEST tier Carrier gas furnace option also rated at up to 80% nominal AFUE efficiency. Reviewed existing utility room layout constraints including carpeted flooring, adjacent cabinetry, and current piping configurations to determine installation requirements. Assessed venting pathways and utility connections fo
Tyler B.
Tyler B. Checked in
Conducted comprehensive assessment of existing HVAC system for heating unit replacement at residential property. Evaluated current Rheem furnace installation located in basement utility area alongside water heater. Performed dimensional measurements of outdoor air conditioning equipment to ensure proper sizing compatibility for new system installation. Documented existing equipment configuration including PVC venting, copper refrigerant lines, and current furnace placement within confined utility space. Prepared detailed replacement estimate for two heating units with equipment options. Presented GOOD tier Carrier gas furnace option rated at up to 80% nominal AFUE efficiency and BEST tier Carrier gas furnace option also rated at up to 80% nominal AFUE efficiency. Reviewed existing utility room layout constraints including carpeted flooring, adjacent cabinetry, and current piping configurations to determine installation requirements. Assessed venting pathways and utility connections fo
Oak Park, IL 60302
Completed comprehensive cooling system maintenance inspection per service agreement. Accessed outdoor condensing unit control board and electrical components, verified proper operation of circuit board and connections. Measured supply air temperature at air handler, recorded 63.6°F reading. All system components operating within normal parameters at time of inspection, no refrigerant issues detected.
Completed comprehensive cooling system maintenance inspection per service agreement. Accessed outdoor condensing unit control board and electrical components, verified proper operation of circuit board and connections. Measured supply air temperature at air handler, recorded 63.6°F reading. All system components operating within normal parameters at time of inspection, no refrigerant issues detected.
Izzy G.
Izzy G. Checked in
Completed comprehensive cooling system maintenance inspection per service agreement. Accessed outdoor condensing unit control board and electrical components, verified proper operation of circuit board and connections. Measured supply air temperature at air handler, recorded 63.6°F reading. All system components operating within normal parameters at time of inspection, no refrigerant issues detected.
Oak Park, IL 60302
Returned to property to complete warranty repair by replacing defective control board. Removed failed circuit board from HVAC unit and installed new warranty replacement part. Verified all wire connections were properly transferred to new board, including terminal block connections and multi-conductor ribbon cables. Tested system operation to confirm proper functionality of new control board. Unit now operating within normal parameters.
Returned to property to complete warranty repair by replacing defective control board. Removed failed circuit board from HVAC unit and installed new warranty replacement part. Verified all wire connections were properly transferred to new board, including terminal block connections and multi-conductor ribbon cables. Tested system operation to confirm proper functionality of new control board. Unit now operating within normal parameters.
Gerardo M.
Gerardo M. Checked in
Returned to property to complete warranty repair by replacing defective control board. Removed failed circuit board from HVAC unit and installed new warranty replacement part. Verified all wire connections were properly transferred to new board, including terminal block connections and multi-conductor ribbon cables. Tested system operation to confirm proper functionality of new control board. Unit now operating within normal parameters.
Oak Park, IL 60302
Provided estimate for mini split installation to add cooling capacity to residential property currently served by boiler heating system only. Assessed exterior side yard location for outdoor condenser placement and verified electrical panel capacity to support new system installation.
Provided estimate for mini split installation to add cooling capacity to residential property currently served by boiler heating system only. Assessed exterior side yard location for outdoor condenser placement and verified electrical panel capacity to support new system installation.
Tyler B.
Tyler B. Checked in
Provided estimate for mini split installation to add cooling capacity to residential property currently served by boiler heating system only. Assessed exterior side yard location for outdoor condenser placement and verified electrical panel capacity to support new system installation.
Oak Park, IL 60302

Client Testimonials

Read the opinions of our satisfied customers.

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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