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 March 2026.
The most recent job was on March 31, 2026.
Job Locations and Reviews
Replaced warranty heat exchanger on Navien boiler system. Disassembled unit housing, removed failed heat exchanger assembly along with circulation motor and associated wiring connections, and installed new warranty replacement heat exchanger. Reconnected all electrical components including motor wiring and plumbing connections, verified proper operation of gas valves and water flow, and reassembled cabinet enclosure to complete repair.
Removed and replaced two garbage disposal units under kitchen sink with black composite basin and brass fixtures. Verified proper drainage operation and tested water flow through both disposal drains to ensure leak-free connections and optimal functionality.
Completed comprehensive cleaning and inspection of single furnace system as part of maintenance agreement. System evaluated and found to be operating within normal parameters. Customer notified of work completion.
Completed comprehensive plumbing inspection of residential property. Examined bathroom plumbing connections including under-sink access panel, verifying proper installation of flexible supply lines, drain assemblies, and shut-off valves. Inspected appliance water supply connections, drainage systems, and associated plumbing components to ensure proper function and identify any potential issues requiring attention.
Completed combustion check on 24-year-old furnace with 89% efficiency rating. Customer expressed interest in replacement unit options and current promotional incentives available for new equipment installation.
Successfully completed installation of new furnace unit in basement utility room. Installed system includes proper connections to existing ductwork, PVC ventilation/drainage pipes, and electrical components. All manufacturer specifications were followed and the unit is functioning correctly with proper clearances maintained.
Successfully completed conversion from traditional water heater to a Navien tankless system. Installed new unit with proper venting through exterior PVC pipes and connected to existing gas line with appropriate fittings. System was tested and confirmed operational with temperature set to 120°F, meeting Energy Star efficiency standards.
Responded to recurring heat system failure with Error E.012 (ignition failure). Diagnosed faulty components and replaced both ignitor and flame sensor to resolve persistent issue. Parts were sourced and installed same-day, restoring proper system operation.
Diagnosed non-operational boiler with failed blower motor. Removed defective motor assembly, installed new replacement unit, and reconnected all wiring harnesses (green, red, yellow, blue, white) to control module. System tested and confirmed proper operation.
Returned to job site to replace sensors under warranty through NTI. Identified and disconnected faulty components from copper pipe fittings in the HVAC system. Parts have been ordered and are being held at shop for installation upon arrival.
Conducted diagnostic inspection on leaking boiler system, identifying excessive dripping from water pressure release valve causing water accumulation in basement. Examined dual boiler units (circa 2019), associated plumbing network, and thermostat system functioning, documenting conditions with photographic evidence prior to scheduled bank appraisal.
Inspected 11-year-old Lennox furnace and identified multiple critical issues including failed collector box and pressure switches. Determined the condensate trap requires replacement as it was permanently glued during original installation, preventing proper maintenance. Took measurements and documented system condition for complete replacement recommendation.
Responded to no-heat call for Carrier furnace system blowing cool air. Conducted system inspection, identified clogged air filter restricting proper airflow. Replaced filter, cleaned components, and verified proper ignition sequence and heat output restoration. System now functioning within manufacturer specifications.
Diagnosed multiple error codes (E227, A475, E229, E271) on thermostat causing temperature drop to 62°F. System was cycled off and on, which resolved heating functionality. Performed electrical testing with UEI DL479 clamp meter showing readings of 0.44 and 0.22 on control wiring.
Performed comprehensive maintenance on non-condensing gas furnace and completed BWC service. Documented significant corrosion at plumbing connection point with extensive rust and mineral buildup on copper pipe fitting. Observed Carrier unit with proper PVC ventilation pipes and inspected surrounding HVAC components including ductwork and connections.
Successfully replaced failed circulator pump with new unit, restoring proper operation of the heating system. System testing confirmed normal functionality with supply/return temperatures within specifications and proper pressure readings of 21.3psi.
Successfully completed full HVAC system replacement including installation of new furnace unit with PVC venting system, thermostat, humidifier, and condensate pump. System was properly mounted, electrically connected, and tested to ensure optimal performance and compliance with manufacturer specifications.
Responded to thermostat malfunction reporting "no power to RH wire" with system not connecting to HVAC and no heat production. Inspection revealed significant dust accumulation in the air filter causing restricted airflow. Replaced dirty filter and restored proper electrical connection to the RH terminal, resulting in full system functionality and heat restoration.
Responded to emergency service call for an inoperative 2-year-old NTi boiler system. Diagnosed and repaired system failure, restoring proper heating function to the residence. Documented complete heating system configuration including circulation pumps, copper piping network, and ventilation components.
Completed installation of new furnace system with electronic control board featuring refrigerant leak detection functionality. Installed and connected 28VA transformer to power the unit, ensuring proper wiring of all control circuits with appropriate wire gauge and color-coding. System was tested and verified operational with all safety features functioning correctly.
