Naperville Service Overview
- Multiple Naperville ZIP Codes: Deljo Heating, Cooling & Plumbing provides heating, air conditioning, plumbing, and indoor air quality services across 60540, 60563, 60564, and 60565.
- Different Housing Generations: Downtown Naperville and 60540 include some of the city’s oldest housing, while 60563 is largely associated with 1980s and 1990s development and 60564 and 60565 contain much more 2000s and 2010s construction.
- Full-Service Mechanical Trades: Deljo provides heating, air conditioning, plumbing, and indoor air quality services across Naperville, including repairs, maintenance visits, replacement systems, and whole-home comfort upgrades.
Naperville is big enough that saying a home is “in Naperville” only tells part of the story. The neighborhoods around Downtown Naperville and 60540 developed differently from North Naperville near I-88, while 60564 and 60565 extend into newer master-planned communities toward the Plainfield border. Those differences show up in the HVAC and plumbing systems we work on every day.
Deljo Heating, Cooling & Plumbing provides heating, air conditioning, plumbing, and indoor air quality services across 60540, 60563, 60564, and 60565. Whether you need a repair, maintenance visit, replacement system, or whole-home comfort upgrade, call 773-829-4295 or contact us online to schedule service.
Getting Around Naperville Means Seeing Several Sides of the City
Downtown Naperville is the city’s most recognizable center. The 1.75-mile Naperville Riverwalk follows the DuPage River through downtown, with Naper Settlement’s 13-acre outdoor history museum and Moser Tower and the Millennium Carillon adding two more familiar landmarks nearby.
Head north into 60563 and the setting shifts toward a mix of established and newer neighborhoods near the I-88 corridor. Nicor Gas, Nalco, and numerous technology and pharmaceutical companies are among the employers connected to this part of Naperville. Go south into 60564 and 60565 and newer master-planned subdivisions from the 2000s and 2010s become much more common.
Naperville now has more than 150,000 residents, making it the second-largest city in Illinois. The city also ranked first in Niche’s 2026 lists for Best City to Live in America, Best City to Raise a Family, and City with the Best Public Schools in America. That scale is important for a service company because Naperville is not one uniform residential market. A call downtown can look very different from one near I-88 or farther south toward Plainfield.
Solving HVAC, Plumbing & Indoor Air Quality Issues in Naperville
Problem: Naperville housing developed across several generations, from some of the city’s oldest homes in established 60540 neighborhoods to newer construction in 60564 and 60565.
Solution: Deljo provides heating, cooling, plumbing, and indoor air quality services across the different housing types and equipment ages found throughout Naperville.
Problem: Water heater replacement, sump pump work, and drain service are recurring plumbing needs across Naperville’s different generations of housing.
Solution: Deljo provides emergency plumbing services, drain cleaning, water heaters, sump pumps, pipe repair, sewer lines, repiping, flood control, and other plumbing services.
Problem: Heating and cooling equipment varies between older downtown properties, established neighborhoods near I-88, and newer southern subdivisions.
Solution: Deljo handles furnace, heat pump, boiler, AC, ductless cooling, maintenance, repair, installation, and replacement services based on the equipment installed in the home.
Naperville Plumbing Repair, Water Heaters & Sump Pump Service
Plumbing needs stretch across every generation of Naperville housing. Established 60540 neighborhoods near downtown include some of the city’s oldest housing, 60563 is largely associated with 1980s and 1990s development, and the southern ZIP codes contain much more 2000s and 2010s construction. Water heater replacement, sump pump work, and drain service are recurring needs across that entire range.
Deljo provides:
- Drain cleaning
- Water heaters
- Whole-home water filters
- Pipe repair
- Frozen pipe service
- Flood control
- Sump pumps
- Plumbing fixtures
- Repiping
- Sewer lines
- Showers and bathtubs
That means the plumbing call itself can vary considerably. One homeowner may need a drain cleared or a water heater replaced. Another may be dealing with a sump pump, piping issue, sewer line, or larger plumbing update.
Naper Settlement sits in the heart of the original downtown area and preserves a much earlier chapter of Naperville’s development. Travel south toward the Plainfield border and the residential landscape represents a much newer period. Plumbing service has to work across both.
Facing a drain clog, water heater issue, or pipe repair? Call 773-829-4295 now for fast, expert plumbing service in Naperville!
Furnace, Heat Pump & Boiler Service Throughout Naperville
Heating work changes as we move between Naperville ZIP codes. Furnaces dominate the city’s ducted single-family homes, but older pre-war properties near the original downtown core in 60540 can still have boiler or steam heat. North Naperville and the newer southern neighborhoods bring another mix of equipment ages and replacement needs.
For heating, Deljo handles:
- Heating installation
- Heating repair
- Heating maintenance
- Furnace service and replacement
- Heat pump service
- Boiler service
High-efficiency furnace replacement is a major part of the Naperville service mix. Two-stage and variable-speed systems also give homeowners options when they want something beyond a basic replacement.
The city’s school communities provide another set of familiar local reference points. Naperville North and Naperville Central High Schools are major identity anchors, and Naperville’s public schools were part of its No. 1 Niche ranking for Best Public Schools in America in 2026.
For us, though, the heating decision comes back to what is installed in the home. A boiler near the downtown core and a furnace in a newer South Naperville subdivision do not call for the same conversation.
“Andre did a great job; was detailed; and communicated everything he did and recommendations to keep the units running smoothly.”
Tim P
Stay warm all winter long! Call Deljo at 773-829-4295 or schedule your heating repair or furnace replacement online today.
Indoor Air Quality, Zoning & Smarter Home Comfort in Naperville
Naperville’s large ducted single-family housing stock makes whole-home controls and indoor air quality equipment a natural extension of heating and cooling service. Smart thermostats and zoning are especially relevant for homeowners who want more control over different parts of the house, while high-efficiency system upgrades are already in strong demand across the city.
Whole-home comfort options include:
- Air duct cleaning
- Aeroseal
- Indoor air quality inspection and testing
- Air filtration
- Purifying ionizers
- Air purifiers
- Whole-home humidifiers
- Whole-home dehumidifiers
- Thermostats
- AC coil and condenser cleaning
Filtration and purification address the air moving through the HVAC system. Humidifiers and dehumidifiers add another layer of control, while zoning and smart thermostats can change how homeowners manage comfort from one area of the house to another.
That fits a city where residential expectations are high and the household income is among the highest in Illinois. Naperville Park District programming also keeps community spaces active through the year, while Riverwalk events bring regular activity into the downtown core.
“Alan was fantastic. Really efficient and helpful. Made sure to check all the additional things I had questions about, in addition to changing our filter. He was really nice and enjoyable to meet! He even helped me move something on my house that I couldn’t move being pregnant, which was appreciated! 5 stars”
Stephanie R
AC Repair, Replacement & Cooling Service in Naperville, IL
Central air conditioning is the dominant cooling setup across Naperville’s mostly ducted single-family housing. The equipment ages are not uniform, however. HVAC systems in 60540, 60563, 60564, and 60565 are reaching replacement cycles at the same time even though those areas developed during different decades.
When the cooling system needs attention, Deljo can help with:
For homeowners replacing central AC, two-stage and variable-speed equipment provide additional high-efficiency options. Ductless AC can also be considered when a particular area needs a different cooling approach.
Summer brings some of Naperville’s biggest local events. Ribfest at Knoch Park is one of the largest rib festivals in the country, while Last Fling takes over Labor Day weekend as one of the largest suburban festivals in the Chicago area. Centennial Beach, created from a converted rock quarry, gives the city another distinctive warm-weather destination.
Those are the weekends when Naperville is busy outside the house. Inside, you want the AC system doing its job without demanding your attention.
“Joe was amazing. Came by on time and fixed the problem quickly. I would definitely recommend him and this company for your heating and cooling needs. Thanks!”
Rebecca C
Beat the summer heat with reliable AC repairs and high-efficiency cooling upgrades. Call 773-829-4295 to book your cooling service!
One Naperville Address, One System at a Time
Naperville may have more than 150,000 residents and four major ZIP codes in this service area, but nobody calls Deljo because they need help with “the Naperville housing market.” You call because the furnace stopped working, the AC is not keeping up, the water heater needs attention, or you want better control over the comfort inside your own home.
That could put us near Moser Tower and the Riverwalk, north toward the I-88 corridor, or south in 60564 or 60565. Wherever the call comes from, Deljo Heating, Cooling & Plumbing can help with heating, cooling, plumbing, and indoor air quality. Call 773-829-4295 or contact us online to schedule service in Naperville.
“Andre did a great job; was detailed; and communicated everything he did and recommendations to keep the units running smoothly.”
Tim P
Call 773-829-4295 or contact us online today to schedule heating, AC, plumbing, or indoor air quality service in Naperville, IL!
Naperville Homeowners FAQ
What ZIP codes does Deljo serve in Naperville?
A: Deljo Heating, Cooling & Plumbing provides heating, air conditioning, plumbing, and indoor air quality services across 60540, 60563, 60564, and 60565.
What heating systems are common in Naperville homes?
A: Furnaces dominate the city’s ducted single-family homes, while older pre-war properties near the original downtown core in 60540 can still have boiler or steam heat. North Naperville and newer southern neighborhoods bring another mix of equipment ages and replacement needs.
Does Deljo provide boiler and furnace service in Naperville?
A: Yes. Deljo handles 24/7 emergency heating service, heating installation, heating repair, heating maintenance, furnace service and replacement, heat pump service, and boiler service.
What plumbing services does Deljo provide in Naperville?
A: Deljo provides emergency plumbing services, drain cleaning, water heaters, whole-home water filters, pipe repair, frozen pipe service, flood control, sump pumps, plumbing fixtures, repiping, sewer lines, and showers and bathtubs.
What types of plumbing issues can homeowners experience?
A: Plumbing needs can vary considerably. One homeowner may need a drain cleared or a water heater replaced. Another may be dealing with a sump pump, piping issue, sewer line, or larger plumbing update.
What air conditioning services are available in Naperville?
A: Deljo can help with AC repair, AC installation, AC maintenance, heat pump service, and ductless AC.
Are high-efficiency furnace and AC options available?
A: High-efficiency furnace replacement is a major part of the Naperville service mix. Two-stage and variable-speed systems provide additional options for both furnace and central AC replacement.
What indoor air quality services are available in Naperville?
A: Whole-home comfort options include air duct cleaning, Aeroseal, indoor air quality inspection and testing, air filtration, purifying ionizers, air purifiers, whole-home humidifiers, whole-home dehumidifiers, thermostats, and AC coil and condenser cleaning.
Can zoning and smart thermostats provide more control over home comfort?
A: Yes. Smart thermostats and zoning are relevant for homeowners who want more control over different parts of the house. Zoning and smart thermostats can change how homeowners manage comfort from one area of the house to another.
Does Deljo provide heating, cooling, plumbing, and indoor air quality service throughout Naperville?
A: Yes. Deljo Heating, Cooling & Plumbing provides heating, cooling, plumbing, and indoor air quality service throughout Naperville, including 60540, 60563, 60564, and 60565.
Page Updated on September 18, 2026
Recent Jobs and Reviews in Naperville, IL
Naperville, IL at a glance
Deljo Heating, Cooling & Plumbing has completed 15 jobs in Naperville, IL between July 2026 and September 2026.
The most recent job was on September 28, 2026.
Job Locations and Reviews
Conducted comprehensive site evaluation for tankless water heater conversion at residential property. Assessed existing tank-style water heater installation showing significant age-related deterioration with visible rust staining on exterior surface. Documented current plumbing configuration including copper supply lines, brass shutoff valves, white PVC discharge piping, and expansion tank. Evaluated utility room infrastructure including concrete block walls, available clearances, existing electrical service, gas connections, and ventilation requirements. Provided detailed estimate for complete removal of conventional storage tank unit and installation of new tankless water heating system with necessary upgrades to meet current code requirements.
Provided estimate for replacement of 15-year-old furnace system. Performed on-site assessment including measurements of existing equipment and documentation of current HVAC configuration and adjacent water heater installation to determine proper replacement specifications.
Responded to report of leak coming from bathroom ceiling. Upon inspection, accessed laundry area and examined washing machine water supply connections, including flexible hoses and shut-off valves mounted in wall alcove. Documented existing plumbing configuration with photographs for further assessment and repair recommendations.
Responded to service call for sump pump running continuously. Upon inspection, identified float switch malfunction causing pump to cycle without shutting off. Replaced faulty float switch assembly and tested system operation to ensure proper activation and deactivation at correct water levels, restoring normal pump function.
Completed installation of a 50-gallon Bradford White tanked water heater in residential utility space. Installed new expansion tank to protect the system from thermal expansion pressure damage and ensure code compliance. All copper supply lines were properly connected, PVC venting system was routed and secured, and pressure relief valve discharge piping was installed per manufacturer specifications. System was tested for proper operation, checked for leaks, and verified all connections meet current plumbing standards.
Completed preventive maintenance inspection on furnace system over 10 years old per maintenance agreement. Performed comprehensive system evaluation including electrical component testing, verified proper wiring connections, checked capacitor condition, and documented equipment condition with photos for service records.
Responded to service call for leaking main shut-off valve. Upon arrival, located valve in upper-floor utility area and assessed the leak condition. Repaired or replaced the faulty shut-off valve to eliminate water seepage and restore proper function to the main water supply control system.
Responded to no cooling complaint on residential air conditioning system. Upon arrival, performed diagnostic testing on outdoor condenser unit and identified failed run capacitor. Verified capacitor failure using digital multimeter, confirming inadequate microfarad reading and preventing compressor from operating properly. Replaced defective dual run capacitor with new Totaline P291-4554RS capacitor meeting manufacturer specifications. Tested system operation, confirmed proper amperage draw on compressor, and verified unit returned to normal cooling operation.
Conducted on-site assessment of existing sump pump and laundry ejector pit pump systems requiring replacement. Inspected utility room containing two black cylindrical pump units with associated white PVC discharge piping and electrical connections. Evaluated current Watchdog sump pump installation, noting vertical discharge pipe configuration, electrical wiring routing, and pump positioning within pit. Assessed laundry ejector pit pump system, examining discharge plumbing, vent piping, and power supply connections. Documented existing piping layout including various diameter PVC pipes, fittings, elbows, and connection points throughout the mechanical space. Photographed current equipment configuration, pipe routing, and installation details for estimate preparation. Noted water staining on concrete walls indicating previous moisture exposure and verified proper drainage requirements for replacement equipment. Reviewed electrical supply connections and wire routing through wooden framin
Successfully completed a comprehensive multi-zone HVAC system replacement involving four complete heating and cooling systems. Removed and replaced four furnaces, four condensing units, four evaporator coils, and four digital thermostats throughout the property. Installed new zoning control system to manage airflow distribution across all zones. Performed complete system commissioning including airflow verification testing, confirming proper CFM readings, static pressure measurements, and blower RPM performance on all units. All thermostats programmed and operational, displaying proper temperature control and system diagnostics. Installation completed over four days with three-person crew to minimize disruption and ensure quality workmanship across all systems.
Performed maintenance on tankless water heater system including descaling flush procedure using circulation pump and cleaning solution as evidenced by bucket collection system with chemical hoses connected to service valves. Conducted diagnostic testing of unit operation and inspected electrical control board, display panel, and associated wiring connections for proper function. Recommended future flush service to maintain optimal performance and prevent mineral buildup in heat exchanger.
Responded to service call for sump pump running continuously for 48 hours. Upon arrival, conducted thorough inspection of sump pump system and associated discharge plumbing in crawlspace and exterior areas. Examined PVC discharge piping configuration, including vertical and horizontal runs with multiple joints and elbows throughout the utility space. Inspected exterior discharge point with cleanout access near foundation. Evaluated pump operation cycle, float switch mechanism, and check valve function. Documented system layout and current conditions via photographs for service records.
Responded to service call for water heater not functioning following flooding event. Upon arrival, found water heater with open access panel and visible internal components exposed. Inspection revealed significant water damage to unit and surrounding mechanical systems. Blower assembly exhibited extensive rust and corrosion throughout, indicating prolonged moisture exposure with heavy oxidation on interior surfaces and metal components. Assessed electrical connections and internal wiring for water damage and safety concerns. Documented equipment condition with photos showing corroded blower wheel, compromised internal components, and flood-related damage to mechanical systems. Provided customer with findings and recommendations for necessary repairs or replacement.
Responded to commercial location for reported RTU not operational. Upon inspection, found severely restricted airflow due to clogged air filter with excessive debris accumulation. Replaced dirty filter with new filter, restoring proper airflow to system. Unit tested and confirmed operational with normal cooling cycle and adequate airflow at registers.
Responded to service call for leaking bathtub fixture. Upon inspection, identified deteriorated valve assembly and corroded escutcheon plate causing water seepage. Removed old tub and shower diverter valve system, replaced with new chrome-finished fixture assembly including circular escutcheon plate, T-handle diverter valve control, and matching curved tub spout. Tested system for proper operation and verified all connections are watertight with no leaks present.
