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 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.
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 service call for recurring fuse failure on recently installed Unico air handler. Performed comprehensive electrical diagnostics using clamp meter and multimeter to isolate the fault. Testing confirmed short circuit in existing low voltage control wiring between thermostat and air handler. Original installation utilized existing low voltage wire, which was determined to be damaged and causing intermittent short to ground. Ran new 18/8 thermostat wire from air handler location to thermostat, replacing compromised conductor. Secured and properly supported new wire run per manufacturer specifications. Tested all control circuits for proper voltage and continuity. Verified system operation through complete heating and cooling cycles with no fuse failures. Unit now operating within normal parameters.
Performed comprehensive maintenance on air conditioning system and air handler as part of agreement service. Conducted complete system inspection including thermostat functionality verification, ductwork assessment in attic space, and equipment operational checks. System currently operating at setpoint with thermostat displaying proper temperature readings. Noted previous recommendation for refrigerant evaluation from last service visit; will continue monitoring system performance. All accessible components inspected and found to be functioning within normal parameters at time of service.
Responded to boiler leak complaint and performed diagnostic inspection. Upon arrival, found active water seepage from boiler system requiring immediate attention. Observed pressure gauge reading at zero position and noted brass drain valve assembly with collection bucket in place beneath unit showing signs of mineral deposits and water discharge. Identified leak source at lower boiler connection point. Completed call-of-the-week (COTW) service evaluation, documented system conditions with photographic evidence, and provided assessment findings. Unit requires follow-up repair to address leaking component and restore proper system operation.
Performed comprehensive maintenance service on residential HVAC system including condenser unit and air handler as part of preventative maintenance agreement. Inspected evaporator coil assembly with finned heat exchanger, verified proper operation of blower motor and associated components, and checked refrigerant lines for secure connections. Examined return air filter grill (14x36x1) and confirmed adequate airflow throughout the system, ensuring all components are functioning within manufacturer specifications for optimal cooling performance.
Returned to address ongoing zoning programming issues with the boiler system under warranty. Performed diagnostic evaluation of the zone control interface and programming parameters, documented system configuration with photos of the boiler installation and control display panel for technical support review. Further troubleshooting required to resolve zoning control malfunction.
Completed comprehensive maintenance agreement inspection on gas furnace, water heater, and two ductless mini-split heads. Performed thorough system evaluation including blower motor assembly, electrical connections, and all plumbing components. All equipment found operating within normal parameters with no immediate service requirements identified.
Responded to emergency service call for boiler system continuing to circulate hot water to radiators despite thermostat being turned off, causing simultaneous heating and cooling operation. Inspected boiler controls, circulator pump operation, and thermostat wiring connections. Diagnosed control malfunction preventing proper shutdown of hot water circulation when heating mode was disabled. Adjusted system controls and verified proper operation to ensure radiators no longer receive hot water flow when thermostat heat setting is off, resolving conflict with air conditioning system operation.
Conducted boiler replacement estimate for 20-year-old existing system. Inspected current boiler installation in basement mechanical room, documenting equipment configuration including existing ductwork, copper piping distribution, and air handling components. Observed frost accumulation on copper supply lines at junction points, indicating potential insulation deficiencies or system operational issues. Evaluated mechanical room layout, existing piping infrastructure including copper supply lines and PVC drainage, electrical service panel access, and overall system integration. Photographed equipment for replacement specifications and provided homeowner with recommendations for new boiler installation.
Returned to site and successfully replaced the defective gas valve and pressure relief valve on the heating unit. Removed the old components, installed new factory-specified gas valve with proper torque specifications, and replaced the pressure relief valve to restore safe operation. Tested system operation and verified proper gas flow and pressure settings upon completion.
Conducted comprehensive assessment for AC replacement quote, including inspection of electrical panel with circuit breakers labeled for HVAC systems and examination of attic installation area with exposed wooden structure and existing ventilation access. Photos documented current electrical capacity and installation space to ensure proper system specifications for the replacement unit.
Performed diagnostic inspection of radiator system, documenting significant wall deterioration and moisture damage at pipe connection points. Temporarily removed radiator unit from damaged blue-tiled wall to assess extent of compromised mounting area and pipe fittings requiring future repair.
Performed routine maintenance inspection on boiler and water heater per service agreement. Examined expansion tanks (blue PROFLO tank and green pressure tank) connected to copper plumbing system. Both tanks appear to be functioning properly with no signs of leakage at connection points, though noted some moisture staining on nearby wall that should be monitored.
Completed comprehensive plumbing system assessment and sold repair services for multiple issues. Identified and recommended replacement for thermostatic shower cartridge, toilet rebuild, corroded p-trap in basement laundry area, and provided replacement options for three angle stops, kitchen faucet, and garbage disposal unit. Documented existing conditions with detailed photos for service record.
Successfully completed a full HVAC system replacement, installing a new Carrier condenser unit on the existing concrete pad. Replaced deteriorated copper refrigerant lines that showed significant corrosion and oxidation, and installed new brass service valves to ensure proper system operation and maintenance access.
Conducted assessment of 10-11 year old HVAC system (Carrier brand) showing significant internal rust formation and motor degradation. Evaluation revealed aging equipment with compromised components despite the unit having easy access. Recommendation provided for full system replacement due to age-related deterioration and potential reliability concerns.
Performed scheduled maintenance on residential furnace and humidifier per agreement. Replaced 16x25x1 filter with new general specification filter. Inspected blower wheel assembly and ductwork, documenting current condition with photos. Completed COTW (Cleaned On The Way) service ensuring optimal system operation.
Performed routine maintenance on two boilers per agreement. Inspected and verified proper operation of Smith water heater system and Amtrol Extrol expansion vessel. All components, including copper piping, valves, and connections, were examined and found to be in normal working condition with no signs of leakage or deterioration.
Performed blower wheel cleaning service for Ernesto. Removed blower wheel assembly, thoroughly cleaned accumulated debris and residue from fan blades, and reinstalled component. Cleaning completed as contracted on work order.
