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 9 jobs in Evanston, IL in February 2026.
The most recent job was on February 18, 2026.
Job Locations and Reviews
Performed diagnostic evaluation on aging furnace system (10+ years) in response to no-heat complaint. Inspected thermostat functionality, which displayed proper temperature reading (69°) and operating status. Conducted detailed inspection of heat exchanger and connection points using camera equipment, revealing significant deterioration that impacts system safety and efficiency. Recommended replacement options based on equipment age and condition findings.
Responded to no-heat call for a Lennox system. Diagnosed issue with thermostat reporting indoor temperature of 53°F while set to 62°F with heating mode active. Performed multimeter testing on blower motor and electrical components, identifying faulty control board causing system failure. Replaced control board and verified proper operation, restoring heat functionality.
Completed furnace replacement with full PVC venting system installation. New venting system properly routed through utility area with appropriate elbows and connections to ensure proper exhaust. All components tested and verified to be in working order with no leaks detected.
Completed installation of refrigerator water supply line and performed minor copper repair in bathroom. Work included connecting proper water line fittings to ensure reliable water delivery to refrigerator while addressing small copper pipe issues in the bathroom plumbing system. Customer received appropriate pricing for completed service.
Responded to a no-heat emergency call for an aging furnace (10+ years) exhibiting dangerous conditions. Diagnostic inspection with specialized camera equipment revealed critical safety hazards including carbon monoxide leakage measuring 2000 PPM at exterior exhaust and compromised PVC venting pipe showing heat damage. Additionally identified natural gas leak confirmed by utility company, which had already recommended system shutdown. Observed evidence of moisture damage to blower assembly housing and mounting platform.
Performed scheduled maintenance on furnace and humidifier according to service agreement, which included replacing 16x20x1 filter, performing gas safety check, and cleaning coil on the way. Used hex key for mechanical adjustments and conducted carbon monoxide testing with Fieldpiece detector, which showed acceptable levels at 2ppm. Additional blower wheel cleaning was completed as requested.
Responded to customer complaint of loud furnace noise and vent concern. Diagnostic testing revealed indoor temperature at 21.8°F and gas pressure readings of 0.02 WC on both inlet and outlet. Adjusted gas pressure to manufacturer specifications and cleaned internal components to eliminate noise. Secured loose vent connection as requested.
Performed diagnostic evaluation on 30-year-old boiler system responding to recurring issue from previous fall service. Inspected interior components including heat exchanger tubes showing signs of wear and weathering, and examined connection points where copper supply lines attach to the main system. Utilized specialized probe tool to assess operational parameters and system integrity in utility area.
Performed routine maintenance agreement service on customer's heating system, which included inspecting and servicing the furnace, humidifier, and tankless water heater. Checked Ecobee thermostat functionality and verified proper operation of plumbing connections to the tankless unit. All systems functioning within normal parameters.
