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 October 2026 and November 2026.
The most recent job was on November 10, 2026.
Deljo Heating, Cooling & Plumbing has completed 312 jobs in Evanston, IL in the last 12 months.
Job Locations and Reviews
Performed seasonal maintenance on gas furnace, including cleaning of the blower assembly and inspection of the squirrel-cage wheel, scroll housing, inducer motor, pressure switch, gas valve, manifold, wiring, and control board; no cracks, rust, or other anomalies were found. Replaced the 20x25x1 air filter and the #35 humidifier water panel (GS), and the system was left operating normally.
Performed scheduled maintenance on the gas furnace and humidifier, including replacement of the 16x25x1 air filter and inspection of the blower assembly, where light dust accumulation was noted on the squirrel-cage wheel blades and debris was found between blades along the lower section. Verified condensate drain and PVC venting connections, and observed condensation on the coil housing consistent with normal operation. System was left operational following the seasonal tune-up.
Performed scheduled maintenance on the furnace, humidifier, water heater, and garage unit heater, including a 20x25x1 filter replacement and a 990-13 GS humidifier pad replacement. Verified proper burner operation with a stable blue flame at the furnace viewing port and used an inspection camera to evaluate internal components. Also inspected the air conditioning system, which missed its seasonal maintenance due to roof work, to assess its condition.
Replaced the existing gas tanked water heater with a new Bradford White unit, reconnecting the gas supply, copper water lines, and flue, and verifying the expansion tank and drip pan were properly in place. Confirmed no visible leaks, rust, or damage at the connections.
Responded to a no-hot-water complaint on a gas-fired storage water heater and performed diagnostic inspection of the unit, including the flue vent, gas supply piping, water supply connections, and thermal expansion tank. No visible leaks, corrosion, or damage were found at the tank or associated piping, and the system was checked for proper operation to restore hot water service.
Responded to a reported gas leak at a two-boiler system and inspected the boiler installation and associated gas piping. Documented the gas supply piping, including the black iron piping, fittings, unions, and valve assembly, and noted that the leaking gas piping is separate from the boiler installation work. Reviewed the gas utility's findings, which also recommended bleeding the radiators and checking system pressure, and advised that gas service remain off until the identified leaks are repaired and the system is verified leak-free.
Performed scheduled maintenance under the service agreement on two furnaces, one garage heater, and one humidifier, including inspection and cleaning of the blower assembly, which was found in clean condition with no signs of rust, corrosion, or damage. Verified system components for proper operation and replaced the 16x25x4 media filters as covered under the agreement, with the humidifier pad serviced as part of the visit. All equipment left in normal working order.
Responded to an E302 error code on a Navien tankless water heater and performed maintenance on the dual-unit installation, which includes two wall-mounted tankless heaters with PVC venting and a recirculation loop with circulator pump, valves, and copper piping. Inspected the units, venting, and associated plumbing and electrical connections to address the fault condition and restore proper operation.
Performed scheduled maintenance on a Carrier gas-fired furnace under the maintenance agreement, including inspection of the flue venting, plenum, and installed air purification unit. Removed and vacuumed the reusable metal mesh air filters to clear accumulated dust and debris, restoring proper airflow.
Returned to complete startup of the newly installed split system after electrical work was finished, verifying condenser, condensate drain, and control wiring connections. Confirmed the P-trap and condensate pump were properly installed and wired, and inspected the elevated condenser pad, noting water staining and debris beneath the unit that should be monitored for drainage issues. System was started and tested for proper operation.
Replaced the existing steam boiler in a confined basement utility closet, including disconnection and removal of the old unit and installation of the new boiler with associated supply and return piping, valves, and flue/venting connections. Work was performed with floor protection in place, and the area was kept clear of debris around the adjacent gas water heater and floor drain throughout the installation.
Performed annual maintenance on two gas furnaces, including inspection of the ignition and flame sensing components and electrical testing with a clamp meter to verify proper operation. Used a borescope to inspect internal heat exchanger and coil passages, with no visible damage or obstructions noted, and confirmed both units are operating safely and within normal parameters.
Performed scheduled maintenance on the furnace, humidifier, and gas-fired water heater under the maintenance agreement. Inspected the water heater's gas control valve, gas supply piping and union, and combustion venting, noting loose control wiring, and found aged copper supply piping and a shutoff valve with mineral deposits and discoloration at the joints and fittings. Documented the condition of the galvanized flue connection and surrounding piping for future monitoring and recommended follow-up.
Responded to a no-heat call reporting furnace overheating and erratic thermostat operation. Inspected the control compartment, found the control board and its associated relays to be the source of the malfunction, and replaced the faulty relays. Verified wiring connections and tested system operation, confirming proper thermostat response and normal heating cycle without overheating.
Removed the existing furnace and installed a new Carrier upright gas furnace, connecting it to the existing supply plenum and galvanized ductwork, flue venting, PVC condensate drain, and electrical supply with a properly secured junction box. Sealed duct connections, verified system operation, and left the equipment area clean with no visible damage or leaks.
Performed on-site evaluation of a 30+ year-old steam boiler system in a condominium mechanical room for full replacement. Documented the existing boiler, controls, gauges, and heavily oxidized iron piping and fittings, and took clearance measurements of the mechanical space to support equipment sizing and replacement planning.
Evaluated a 9-year-old gas furnace in a utility closet for replacement, inspecting the flue venting, plenum and ductwork, condensate drain line, and electrical connections, with no significant rust, frost, or damage observed. Assessed the existing installation and access routes, including the staircase leading to the equipment space, to prepare a replacement quote.
Installed a humidifier serving the second floor, including routing and securing of supply lines and ductwork in the attic space, and restored displaced insulation around the work area. Cleaned the evaporator coil to remove buildup and restore proper airflow and heat transfer, and flushed the water heater to clear sediment and improve efficiency. Inspected attic piping insulation, noting a split section of foam pipe insulation over the copper line.
Responded to a no-heat call on a 7-year-old gas furnace and opened the cabinet to inspect the gas valve, pressure switches, inducer assembly, and control wiring. Used a clamp meter in µA/DC mode to test flame sensor circuit current (reading 0.0 µA, indicating no flame signal), and inspected the wiring harness and panel/junction box area for faults, with no visible damage, corrosion, or loose connections observed. Heating system was diagnosed for flame sensing and ignition sequence issues.
Replaced the existing Unico high-velocity air conditioning system, including the outdoor condenser and indoor air handler with evaporator coil, in the basement utility space. Removed the old equipment, then installed and connected the new unit, including refrigerant line set, electrical supply and control wiring, and the supply duct and flexible conduit connections. Completed system startup and verified proper operation and cooling performance.
