If you need HVAC service in Winnetka, you need look no further than Deljo Heating & Cooling. We’ve been serving homes and businesses throughout the greater Chicagoland area since 1922, and when you’re in need of assistance, we hope Deljo will be the first company you think of for installation, maintenance, and repair services.
Heating Services in Winnetka
Whatever your heating issues, Deljo Heating & Cooling can take care of it.
- Furnace installation – Our technicians are fully licensed, and we install only the highest quality heating systems available today.
- Furnace maintenance – Regular maintenance performed by our expert technicians can prolong the life of your heating system and help reduce your energy costs.
- Furnace repair – The last thing you want is a faulty furnace that leaves you freezing in winter. We also know you can never tell when your furnace is going out on you, and that’s why the furnace repair specialists at Deljo are available 24/7 to handle any heating emergency that occurs, no matter the time or the day!
- Boiler installation, maintenance, and repair – The average boiler should last 10 – 15 years, and if yours is nearing the end of its life span, you may need to consider installing a new boiler before the worst of the winter weather arrives. Deljo can do that for you, and we also provide expert boiler maintenance and repair services.
Cooling Services in Winnetka
The same goes for cooling services. If you need assistance, Deljo is here to provide it in many ways.
- Air conditioning installation – When it comes to AC installation in Winnetka, you don’t want to hire just any company. Let our licensed technicians perform the job to your complete satisfaction.
- Air conditioning maintenance – Regular maintenance of your AC system performed by highly qualified technicians extends the life of your AC unit and can lead to savings of up to 30% during the heat of summer.
- Air conditioning repair – There’s no need to sweat it out if your AC unit has quit working or it’s not cooling your home or business. The expert technicians at Deljo are available to provide relief 24/7.
- Ductless mini-split installation, maintenance, and repair – Ductless mini-split systems are a great way to heat and cool older homes that don’t have ductwork. They also give you the option of heating or cooling individual rooms to your comfort level. If you want a mini-split system for your home in Winnetka, or you need maintenance or repair services, Deljo can handle the job for you.
Indoor Air Quality Services in Winnetka
The quality of the air in your home plays an important role in the health of your family, and to help keep the air you’re breathing as clean as possible, Deljo Heating & Cooling can install and maintain either the Carrier Infinity Air Purifier GAPA or the REME HALO® Whole Home In-Duct Air Purifier.
Either system will greatly improve the quality of the air in your home through the elimination of pathogens and indoor pollutants.
Expert HVAC Service in Winnetka, IL: Deljo Heating & Cooling
If you’re seeking a reliable contractor that can work on your HVAC in Winnetka, Illinois, then Deljo Heating & Cooling is the company to call. We’ve been working with heating and air conditioning customers in Winnetka and the greater Chicago area for the past century.
One of the many reasons we’re one of the area’s top heating and air conditioning system companies is that we provide emergency repairs 24/7. Superior customer satisfaction is what we strive for, which is why any AC or heating repairs are addressed as soon as possible.
We want your home to stay comfortable without minimal disruptions to your schedule, so don’t delay. Give Deljo Heating & Cooling a call at 773-829-4295 or contact our customer service team online today to schedule the very best HVAC service around Chicago’s north shore.
Recent Jobs and Reviews in Winnetka, IL
Job Locations and Reviews
Sal C.
# HVAC Service Call - No Cool, Dual System Responded to service call for two non-operational air conditioning systems. Upon arrival, performed diagnostic evaluation of outdoor condenser units and indoor thermostat controls. Primary unit inspected showed aged condenser positioned on concrete pad with visible debris accumulation at base. Refrigerant lines and electrical connections evaluated for integrity. Indoor thermostat displayed 81°F ambient temperature with setpoint at 70°F in cooling mode with auto fan setting, confirming lack of cooling operation. Conducted comprehensive system assessment including electrical supply verification, contactor operation testing, and capacitor evaluation. Both systems exhibited failure to initiate due to age-related component degradation typical of units exceeding 10-year service life. Documented equipment condition through photographic records showing outdoor unit configuration, mounting, and thermostat interface for service history. Provided cust
Winnetka, IL 60093
Sam A.
Performed preventative maintenance on three outdoor condenser units and three electronic air cleaners as part of scheduled agreement service. Conducted thorough coil washing on all three condensers to remove accumulated dirt, debris, and organic material that can restrict airflow and reduce system efficiency. Cleaned and serviced electronic air cleaner components, including blower wheels and internal surfaces, to ensure optimal indoor air quality performance. All equipment was inspected during service and found to be operating within normal parameters following maintenance completion.
Winnetka, IL 60093
Sal C.
# HVAC Service Call - No Cooling Issue with Zoning Problem Responded to service call for air conditioning system less than 5 years old experiencing no cooling in one zone and clicking noise upon startup. Upon arrival, conducted visual inspection of thermostat controls and system operation. Examined Honeywell Home ProSeries thermostat displaying abnormal reading of 99 degrees in heat mode despite cooling season. Verified thermostat wiring connections at wall plate and confirmed proper mounting. Assessed zone control functionality and damper operation for affected area of residence. Investigated clicking sound reported during system startup by monitoring compressor contactor, relay switches, and capacitor operation. Checked for debris in outdoor unit and inspected fan motor bearings. Evaluated refrigerant pressures and airflow through supply registers in non-cooling zone. Identified thermostat configuration error causing improper system mode and potential zone damper malfunction rest
Winnetka, IL 60093
Angel G.
Performed routine maintenance inspection on residential HVAC system under preventative maintenance agreement. Inspected outdoor condensing unit, verified proper operation of fan assembly and blower wheel, checked refrigerant lines and electrical connections, and documented system condition with photographs. All components found to be in satisfactory working order with no immediate service needs identified.
Winnetka, IL 60093
Matt B.
Responded to service call for newly installed AC unit not turning on. Upon arrival, performed electrical diagnostics using clamp meter at outdoor condenser unit. Measured current draw of 568 units and inspected line voltage wiring connections at service disconnect. Verified proper electrical supply to condenser, checked all wire terminations, and ensured unit received adequate power. System restored to operational status with compressor and condenser fan functioning properly.
Winnetka, IL 60093
Joe A.
Responded to no cooling complaint on residential AC unit installed in June 2019. Upon inspection, found evaporator coil heavily contaminated with dust, debris, and organic material lodged between fins, severely restricting airflow and heat transfer capability. Cleaned evaporator coil thoroughly to restore proper airflow and system efficiency. Inspected exterior condensate drain connections and plumbing components, which showed normal weathering but remained functional. Verified unit is covered under 10-year parts warranty through Carrier and 10-year labor warranty contingent upon continued annual maintenance. System restored to proper cooling operation.
Winnetka, IL 60093
Gerardo M.
Responded to no cooling complaint on residential HVAC system. Upon arrival, customer was out of town and unit had been non-operational for multiple days per thermostat app notification. Inspected outdoor condensing unit and found failed dual run capacitor with visible aging, discoloration, and compromised wire connections. Replaced defective capacitor and verified proper electrical connections to compressor and condenser fan motor. Additionally inspected indoor air handler and found heavily soiled air filter restricting airflow, which contributed to system inefficiency and potential premature component failure. Replaced dirty filter with new pleated media filter to restore proper airflow. Cycled system through complete cooling operation and confirmed compressor startup, condenser fan operation, and adequate airflow at registers. System now cooling properly and operating within normal parameters.
Winnetka, IL 60093
Sean W.
Successfully completed full air conditioning system replacement including outdoor condensing unit and indoor evaporator coil. Removed existing equipment and installed new AC unit on concrete pad with proper refrigerant line connections and electrical conduit. System commissioned and verified operating at 69°F supply air temperature, confirming proper cooling performance.
Winnetka, IL 60093
Sam A.
Performed return visit to complete cleaning of two blower assemblies as part of catch-up on the week's scheduled maintenance work. Both squirrel cage blower wheels showed significant dust accumulation on the vertical fins and required thorough cleaning to restore proper airflow and system efficiency. Disassembled blower housings, removed debris from centrifugal fan blades, cleaned gasket seals, and reassembled units to manufacturer specifications.
Winnetka, IL 60093
Tyler B.
Provided comprehensive estimate for complete SpacePak high-velocity HVAC system replacement. Evaluated existing equipment including outdoor condenser unit and indoor Honeywell Home digital thermostat, documented current system configuration and measurements, and presented full replacement options to customer for new high-velocity air conditioning and heating system installation.
Winnetka, IL 60093
Tyler B.
Conducted comprehensive HVAC estimate for replacement of 18-year-old residential air conditioning system. Evaluated existing York brand furnace and air handler configuration in basement utility room, documenting current ductwork connections, refrigerant lines, electrical components, and condensate drainage system. Photographed equipment dimensions and existing infrastructure to determine replacement unit specifications and installation requirements for complete system upgrade.
Winnetka, IL 60093
Sam A.
Responded to senior tech request for non-operational air conditioning system with condenser failure. Upon arrival, verified thermostat was calling for cooling with setpoint at 61°F while indoor temperature registered 67°F in heating mode, indicating system was not responding to cooling demand. Performed diagnostic evaluation of outdoor condenser unit and identified electrical or mechanical failure preventing compressor and condenser fan operation, resulting in complete loss of cooling capacity.
Winnetka, IL 60093
Gabe G.
Responded to no cooling complaint on residential Carrier air conditioning system. Upon arrival, performed system diagnostics and temperature measurements. Recorded supply air temperature of 41.3°F at the ductwork, indicating proper cooling operation. Inspected outdoor condensing units and confirmed both Carrier systems were operational with no visible defects or mechanical issues. System found to be cooling adequately within normal operating parameters at time of service call.
Winnetka, IL 60093
Charlie B.
Responded to no cooling call. Upon arrival, found unit shut down due to tripped water sensor safety switch. Customer had attempted to reset the sensor without success. Inspected condensate drain system and confirmed water presence triggering the safety device. Cleared condensate line blockage, verified proper drainage, and successfully reset water sensor switch. Tested system operation with thermostat set to cooling mode at 78 degrees, confirmed unit cycling properly with fan operation normal. System restored to full cooling function.
Winnetka, IL 60093
Gabe G.
Responded to service call for Carrier HVAC system experiencing multiple fault alerts. Upon arrival, accessed system diagnostics through thermostat control panel and documented recurring error codes including excessive static pressure (210 fault - 25 consecutive occurrences), possible frozen coil conditions (multiple instances), and humidity sensor fault (160 fault - 3 consecutive times). Photographed system event log showing fault history spanning multiple weeks. System requires follow-up evaluation during warmer weather conditions to properly assess airflow restrictions, coil freezing issues, and static pressure concerns when system is under normal cooling load. Consulted with supervisors on-site regarding diagnostic findings and recommended service plan. Initial assessment completed; system monitoring ongoing pending seasonal temperature increase for comprehensive evaluation and repair.
Winnetka, IL 60093
Matt B.
Responded to no cooling complaint on upper-level air conditioning system. Upon inspection, measured supply air temperature at 79.2°F, confirming inadequate cooling performance. Diagnosed system issue and completed necessary repairs to restore proper cooling operation to the upstairs zone, with outdoor condensing units operating normally upon completion.
Winnetka, IL 60093
Angel C.
Completed maintenance agreement service on residential HVAC system including two condenser units and furnace inspection. Verified system temperatures reading 72.6°F, replaced 16x25x1 air filter, and inspected all ductwork connections and PVC condensate lines for proper operation. All equipment functioning within normal parameters upon completion.
Winnetka, IL 60093
Angel C.
Completed preventative maintenance agreement service on residential HVAC system with two condensers. Inspected furnace, air handler, ductwork, and associated mechanical equipment in utility room, verified all components operating within normal parameters. Replaced heavily soiled air filter with new unit to maintain proper airflow and system efficiency.
Winnetka, IL 60093
Jay L.
Completed general service maintenance on two air conditioning systems. Inspected electrical components, capacitors, and wiring connections on outdoor condensing unit, verified proper operation and documented equipment conditions. Performed system evaluation on indoor air handler unit, checked airflow direction markings on PVC drainage lines, and confirmed all mechanical components functioning within normal parameters.
Winnetka, IL 60093
Sam A.
Completed preventative maintenance agreement covering three air conditioning systems and one furnace blower unit. Performed comprehensive system checks including refrigerant pressure testing, visual inspection of all equipment, and operational verification of HVAC components. Filter media replacement not included per service agreement terms.
Winnetka, IL 60093
