For more than a century, Deljo Heating, Cooling & Plumbing 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 & Plumbing 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 & Plumbing 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 between September 2026 and October 2026.
The most recent job was on October 14, 2026.
Deljo Heating, Cooling & Plumbing has completed 283 jobs in Evanston, IL in the last 12 months.
Job Locations and Reviews
Gregory Z.
Performed scheduled maintenance on two steam boilers, including draining and flushing the boiler blowdown lines to remove sediment and sludge from the system. Inspected the gauge glass tubing, valves, piping connections, and electrical controls, with threaded fittings resealed using thread-sealing tape as needed.
Evanston, IL 60201
Charlie B.
Returned to replace a defective flue damper actuator motor on the recently installed boiler under manufacturer warranty. Removed the failed motor from its mounting bracket, installed the new warranty motor, and reconnected the wiring, then verified secure mounting and proper damper blade operation with no visible damage to the flue or connected components.
Evanston, IL 60201
Justin P.
Inspected the laundry area drain and supply plumbing to locate the reported leak and identified staining at the base of the PVC drain assembly where it meets the floor drain. Repaired the PVC drain connections, including primed and cemented joints and fittings, and verified the braided stainless steel supply lines and shutoff valves were secure and leak-free. Tested the system under normal operation to confirm the leak was resolved.
Evanston, IL 60201
Matt B.
Performed scheduled maintenance on a Carrier Infinity gas furnace, an A.O. Smith ProLine XE power-vent water heater, and a humidifier, including replacement of the 20x25x1 air filter and the 990-13 humidifier pad. Inspected the furnace cabinet, PVC intake and exhaust piping, wiring, and ductwork connections, as well as the water heater's power vent blower assembly, venting, supply piping, and expansion tank. Equipment was found in good condition with no visible rust, leaks, or damage, and all components were left operational.
Evanston, IL 60202
Gabe G.
Completed comprehensive maintenance inspection on furnace system per maintenance agreement. Performed visual inspection of ductwork using inspection camera to assess interior condition and identify any potential airflow restrictions or debris accumulation. Conducted temperature differential measurements using digital thermometer to verify proper heat exchanger operation and system performance. Installed new 16x25x1 filtration media to ensure optimal air quality and system efficiency.
Evanston, IL 60202
Gabe G.
Performed comprehensive maintenance check on two furnaces, water heater, and Aprilaire humidifier system as part of maintenance agreement. Replaced air filters including #10, 16x25x1, and 16x20x1 filters. Verified furnace operating temperature at 127.5°F and inspected all ductwork connections and mechanical components for proper operation.
Evanston, IL 60201
Charlie B.
Responded to callback for recently installed boiler system with customer reporting no domestic hot water. Upon inspection, verified indirect water heater connections and circulation, identified issue with aquastat control settings, adjusted temperature parameters to manufacturer specifications, and confirmed hot water delivery restored to all fixtures.
Evanston, IL 60201
Jim C.
Conducted on-site evaluation for complete air conditioning system replacement and assessed feasibility of adding mini split system. Inspected existing evaporator coil assembly within air handler cabinet, documented current electrical connections and ductwork configuration, and evaluated plumbing connections at base of equipment to determine replacement requirements and compatibility with proposed new systems.
Evanston, IL 60201
Gregory Z.
Completed annual maintenance inspection on boiler system under service agreement. Documented existing conditions including expansion tank, piping connections, and system components with photographic evidence. Observed significant moisture infiltration and efflorescence on basement brick wall adjacent to equipment, indicating ongoing water seepage issues that may require future attention to prevent equipment corrosion and structural deterioration.
Evanston, IL 60202
Gerardo M.
Responded to report of water leaking from first-floor radiator in home with 16-year-old boiler system. Upon inspection, identified severe corrosion on radiator valve assembly and associated piping connections. The thermostatic radiator valve (TRV) and metal elbow joint showed significant deterioration with green and yellowish-brown oxidation, crusty deposits, and compromised integrity at connection points. Evidence of long-term moisture exposure was apparent with rust stains and water damage on surrounding surfaces. Repaired the leaking valve assembly, replaced corroded components, and verified system integrity to restore proper heating function and eliminate active water leak.
Evanston, IL 60201
Michael C.
Conducted on-site evaluation of existing 15-year-old air conditioning system for replacement estimate. Inspected outdoor condenser unit positioned on concrete pad against exterior brick wall, noting weathered equipment and overgrown vegetation requiring clearance. Assessed indoor HVAC components in mechanical room, including furnace unit and existing ductwork configuration with PVC piping system. Documented current system specifications and spatial requirements, photographed equipment and installation areas, and provided comprehensive replacement options for new cooling system to meet anticipated 2026 replacement timeline.
Evanston, IL 60201
Sam A.
Completed comprehensive maintenance on three furnaces and two humidifiers per agreement terms. Replaced standard air filters with 16x20x1 and 16x25x1 units, removed accumulated dust and debris from filter media, and cleaned humidifier drain pans which contained sediment buildup. All equipment inspected and operating within normal parameters.
Evanston, IL 60201
Drew W.
Responded to no heat call on furnace under 10 years old. Upon arrival, performed diagnostic testing using temperature probe and multimeter to assess system operation and electrical components. Verified furnace was not producing warm air as reported and conducted thorough inspection of internal components including gas valve, ignition system, wiring connections, and ductwork to identify root cause of heating failure.
Evanston, IL 60201
Giovanni M.
Performed comprehensive preventive maintenance on Carrier furnace and humidifier system under maintenance agreement. Inspected and replaced faulty flame sensor component, which showed signs of carbon buildup affecting ignition performance. Cleaned accumulated dust and debris from air filters and interior cabinet surfaces, removed and serviced mesh filters that exhibited significant dirt loading, and verified proper operation of gas valve connections and piping. Documented system condition through photographic records and confirmed all mechanical components, wiring connections, and safety controls functioning within manufacturer specifications upon completion.
Evanston, IL 60202
Adrian M.
Returned to heat pump installation site to complete warranty work by installing additional wiring kit. Added control wiring to enable proper heat pump operation and integrated humidistat controls with the HVAC system. Verified proper communication between thermostat, heat pump unit, and humidity control components, with digital humidistat displaying correct readings at 62% RH in manual mode.
Evanston, IL 60202
Drew W.
Completed HVAC maintenance agreement inspection of one boiler and two water heaters. Documented existing conditions with photographic evidence showing significant corrosion on pipe connections, threaded fittings, and valve assemblies, along with mineral deposits indicating long-term moisture exposure. Customer advised of aged equipment condition but declined replacement recommendations per explicit request for no upselling.
Evanston, IL 60202
Angel G.
Completed comprehensive maintenance agreement service on residential HVAC system including one furnace and one humidifier unit. Performed thorough inspection of furnace assembly, evaporator coil, and associated components located in basement utility area. Verified proper operation of humidifier system, checked all electrical connections, inspected refrigerant lines and PVC condensate drainage, and confirmed adequate airflow through ductwork. All equipment found operating within manufacturer specifications with no immediate repairs required.
Evanston, IL 60201
Sam A.
Completed comprehensive maintenance agreement inspection on single furnace system. Performed thorough examination of blower wheel assembly, noting normal dust accumulation on impeller and age-appropriate patina on radial fins consistent with regular operation. Verified Honeywell ProSeries thermostat functionality, confirming proper heating mode operation with system actively calling for heat and fan set to auto mode. Filter media replacement not included in this service visit per agreement specifications.
Evanston, IL 60202
Sam A.
Performed preventive maintenance inspection on furnace system under maintenance agreement. During inspection, discovered significant ice buildup on evaporator coil with temperature reading of 14.2°F, indicating potential refrigerant flow restriction or airflow deficiency. Documented equipment condition including condensate management components and verified manufacturer specifications on unit labels. Captured diagnostic imagery showing extent of coil frosting and internal component configuration for maintenance records.
Evanston, IL 60201
Sam A.
Performed comprehensive maintenance on boiler and water heater systems, including combustion analysis and safety inspections. Replaced air filters with 16x20x1 and 16x25x1 units. Inspected recently installed mini split system, checking refrigerant levels, electrical connections, and overall operation. Cleaned mesh filter screen from equipment and verified proper airflow. Confirmed thermostat operation and system controls functioning within normal parameters. All equipment operating safely and efficiently upon completion.
Evanston, IL 60202
