For more than a century, Deljo Heating & Cooling has been the name Evanston homeowners trust for reliable comfort solutions. Whether you need HVAC or plumbing solutions, our team delivers expert care backed by 5-star reviews and over 100 years of experience.
If you’re experiencing an HVAC or plumbing emergency, call us or click the button at the top of the page to schedule service online. Keep reading for an overview of our Evanston HVAC and plumbing services.
Plumbing Services in Evanston
No matter the issue, you can trust Deljo for prompt, affordable, and professional plumbing services. Our team provides comprehensive plumbing repair, from small leaks to major system issues.
If your hot water suddenly runs cold, we specialize in water heater repair, restoring comfort with fast and professional service. For clogged or slow drains, our expert drain cleaning clears buildup and keeps your plumbing flowing smoothly.
Air Conditioning Services in Evanston
Summers in Evanston demand a dependable cooling system. That’s why Deljo offers expert air conditioner repair to restore your comfort quickly when your AC breaks down. From refrigerant issues to electrical malfunctions, our licensed technicians handle every kind of AC issue. We also provide seasonal air conditioning maintenance and professional air conditioning installation to keep your home comfortable all summer long.
Heating Services in Evanston
When temperatures drop, Deljo is here to keep your family warm with expert heating services. If your furnace stops working or struggles to heat evenly, call us for reliable furnace repair. Our technicians provide thorough diagnostics and long-lasting repairs so you’re never left in the cold.
We also specialize in boiler repair and professional heating installation, ensuring your system runs safely and efficiently for years to come.
Why Choose Deljo Heating & Cooling in Evanston?
There are plenty of companies you could call when something goes wrong with your plumbing or HVAC. But Evanston families have been turning to Deljo for generations. The reasons why they do this include:
- We show up when it matters most. Burst pipes and broken furnaces don’t wait for a convenient time. That’s why we’re available 24/7 for emergency HVAC and plumbing services.
- We’ve been doing this for over 100 years. Over our century of operation, we’ve seen it all. We know how to get the job done right the first time.
- Our reputation speaks for itself. We’re proud of the thousands of 5-star reviews we’ve earned. They don’t come from flashy ads. They come from neighbors who were treated fairly and had their problems solved quickly.
- We make comfort affordable. Big repairs and replacements can be stressful. That’s why we offer flexible financing options that take the sting out of an unexpected bill.
- We take care of our customers. With our Gold Star Program, customers get priority scheduling, regular maintenance, and extra perks. It’s our way of saying thank you for trusting us with your home.
At Deljo, it’s simple: we treat you the way we’d want to be treated. That’s been our approach for more than a century, and it’s why so many Evanston families keep our number handy.
Call Your Trusted Evanston Plumbing & HVAC Experts
Ready to take care of that plumbing issue or finally get your heating and cooling running the way it should? Deljo Heating & Cooling is here to help. Give us a call or request an instant quote today and see why Evanston has trusted us for over 100 years.
Recent Jobs and Reviews in Evanston, IL
Evanston, IL at a glance
Deljo Heating, Cooling & Plumbing has completed 20 jobs in Evanston, IL in July 2026.
The most recent job was on July 24, 2026.
Job Locations and Reviews
Responded to warranty call for non-operational thermostat following recent AC installation. Upon arrival, found thermostat completely removed from wall with exposed wiring at ceiling location. Documented existing conditions showing brown, blue, and yellow/green striped wires protruding from opening with visible drywall patching around fixture area. Inspected HVAC system in mechanical room, verifying furnace and ductwork connections were intact. Photographed equipment layout including condensation on vertical duct run. Thermostat requires replacement to restore system operation.
Completed comprehensive cooling system maintenance agreement service on outdoor AC unit. Performed thorough inspection of electrical components including motor-run capacitor and contactor assembly, noting previous capacitor replacement from May 2024. Installed one 201 media filter as included in maintenance agreement and documented system condition with photos showing normal wear consistent with outdoor installation.
Responded to install callback for hot water coil drain hose replacement. Replaced deteriorated drain line and hose clamp assembly due to previous leak condition. Documented water damage and debris accumulation on coil fins and surrounding metal panels with photographic evidence for warranty documentation.
Completed routine HVAC maintenance agreement service, including replacement of 20x25x1 air filter which showed significant dust and debris accumulation. Performed system diagnostics using digital temperature measurement equipment to verify proper air conditioning operation and airflow. Documented pre-service and post-service conditions with photographic evidence showing the contrast between the heavily soiled original filter and clean replacement filter, ensuring optimal system efficiency and air quality.
Performed routine HVAC maintenance agreement service. Inspected and replaced heavily soiled pleated air filter showing significant dust and debris accumulation with new filter to restore proper airflow and system efficiency. Documented filter condition with photographs showing before and after comparison, confirming successful completion of filter replacement service.
Completed cooling system maintenance agreement inspection on residential Carrier air conditioning unit. Performed comprehensive system evaluation including temperature diagnostics, measuring 74.4°F at indoor equipment location, verified proper refrigerant operation, and documented outdoor condenser unit condition with all components functioning within normal parameters.
Completed comprehensive cooling maintenance and system evaluation on residential air conditioning unit. Performed standard preventive maintenance procedures including inspection of condenser unit, verification of proper operation, and temperature measurements with digital instrumentation recording 88.5°F ambient conditions. Unit is accessible at ground level without ladder requirement, positioned on pad with adequate clearance from building exterior and landscaping elements.
Completed routine HVAC maintenance agreement service on residential Carrier furnace and air conditioning system located in utility closet. Performed comprehensive system inspection, documented equipment condition including capacitor and contactor components, verified proper operation of all mechanical systems, and replaced 16x25x1 air filter to maintain optimal airflow and system efficiency.
Performed camera inspection of main sewer line and rodding service as a follow-up visit. Successfully cleared the line and confirmed proper drainage flow with video documentation showing the condition of the pipe interior and cleanout access point in basement utility area.
Completed preventive maintenance on a 10-year-old air conditioning unit. Performed system diagnostics using calibrated testing equipment, including temperature and airflow measurements at supply registers to verify proper system operation and distribution. All measurements were within acceptable parameters, confirming the unit is functioning correctly under the maintenance agreement.
Replaced failed blower motor and breakdown kit on commercial rooftop HVAC unit. Additionally replaced aged, corroded dual-run capacitor with new TITAN PRO TRCFD455 (45+5 MFD, 440/370VAC) and repaired damaged electrical connectors at no charge. Unit tested and returned to normal operation.
Completed comprehensive maintenance agreement service on two air conditioning systems. Inspected and documented humidifier installation including electrical connections, wiring harnesses, and ductwork integration. All components photographed and verified operational, with electrical connections and control mechanisms confirmed secure and functioning properly.
Responded to service call for Rheem tanked water heater with non-functioning pilot light. Upon inspection, diagnosed and resolved pilot light ignition issue, restoring proper operation to the water heating system. Verified hot water delivery temperature at fixture, confirming system returned to normal functionality with temperature reading of 93.3°F at tap.
Responded to call back for recently installed AC unit experiencing loud grinding noise. Upon arrival, accessed indoor air handler and inspected blower assembly. Found blower wheel making contact with housing due to improper mounting during initial installation. Removed blower assembly, realigned motor mount brackets, and reinstalled blower wheel with correct clearances. Verified proper rotation and clearance throughout full range of operation. Replaced air filters and cleared debris from unit interior. Tested system operation across all fan speeds with no abnormal sounds detected. Unit now operating quietly within normal parameters.
Responded to no cooling complaint on second floor for 10-year-old air conditioning system. Upon arrival, found thermostat displaying 99°F ambient temperature with setpoint at 64°F, indicating system was not achieving desired cooling. Performed diagnostic testing including supply air temperature measurement at register, which recorded 88.5°F—well above acceptable cooling range and confirming inadequate system performance. Noted visible dust accumulation on supply register, suggesting potential airflow restrictions. Accessed outdoor condensing unit without requiring ladder assistance and conducted comprehensive system evaluation to identify root cause of cooling failure.
Completed comprehensive air conditioning maintenance agreement inspection on Carrier HVAC system. Performed full checklist including condenser coil inspection for cleanliness and leaks, blower motor and wheel debris check, indoor relative humidity testing, refrigerant level measurement, and cycling of operating controls. Inspected line voltage switch and wiring for safety compliance, verified condensate system drainage, checked all electrical connections for tightness and deterioration, and examined refrigerant lines for visible leaks and insulation condition. System found operating in cooling mode with thermostat set to 70°F and current temperature at 74°F. All components functioning within normal parameters with no immediate concerns identified.
Completed preventive maintenance agreement service on dual condenser system. Inspected and serviced two outdoor condensing units, checked refrigerant levels, cleaned coils, and verified proper operation of both units. Performed interior air handler inspection, examined COMMAND2 control board connections and wiring, verified electrical components functioning properly, inspected ductwork plenum and condensate drainage system for proper operation and cleanliness.
Completed comprehensive three-level plumbing inspection of residential property including basement, two full bathrooms, and one half bathroom. Thoroughly examined sump pump system in basement utility area, documenting vertical discharge pipe assembly with PVC sections and black couplings, verifying proper installation of float switch mechanism and electrical connections. Observed existing rust staining on pipe joints and fittings, noting age-related surface wear on plumbing components. Inspected auxiliary utility piping, electrical junction boxes, and associated wiring runs along basement walls. Photographic documentation captured for all critical plumbing fixtures and mechanical systems throughout all levels of the residence.
Provided estimate for replacement of hardwired in-wall AC unit, including assessment of sleeve condition and insulation requirements around the unit. Evaluated 10+ year old SpacePac system with multiple refrigerant leaks and insufficient cooling capacity, unable to maintain temperatures below 72 degrees, and provided replacement options for both the air handler and compressor unit.
Completed full HVAC system replacement including outdoor condensing unit, Unico air handler, and evaporator coil. Installed new air handler in attic space with proper mounting and leveling on existing floor joists. Connected multiple insulated flex duct runs to air handler for distribution throughout the home. Established condensate drain line with PVC piping and verified proper drainage. Completed all electrical connections including power supply and control wiring between components. Verified system operation with digital thermometer readings showing proper air temperature at 71.9°F. All equipment secured, labeled, and tested for optimal performance.
