Complete Furnace and AC Replacement in the Northwest & West Suburbs
A complete furnace and air conditioner replacement from Pure Comfort typically costs $8,000 to $19,000 installed and takes seven to ten hours. As a Lennox Premier Dealer, we size the system with a load calculation, offer Good, Better and Best options with upfront pricing, and provide financing on approved credit, including 0% APR on select Lennox systems during Lennox promotions.
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When Does Complete System Replacement Make Sense?
Complete system replacement makes sense when both the furnace and AC are aging, the AC uses R-22 refrigerant or the old indoor coil would not match new equipment.
- Both systems are aging togetherWhen the furnace and air conditioner were installed at the same time, they tend to reach the end of their service life within the same few years.
- Major repairs are approachingFacing a significant repair on one system while the other is close behind changes the value of doing the work once.
- Components need to be matchedThe indoor coil, furnace and outdoor unit have to work together within manufacturer requirements, which limits mixed-age combinations.
- Comfort problems affect both seasonsA home that is uncomfortable in both summer and winter usually has a system-wide issue rather than a single equipment fault.
- The blower or ducts need changesAirflow corrections, return-air capacity and duct transitions are far easier to complete while both systems are open.
- You want coordinated coverageDoing both at once lets you align efficiency levels, controls, registration and warranty coverage across the whole system.
One Design Process for Heating and Cooling
A complete system is planned as one project rather than two replacements that happen to share a date.
- Evaluate both loads. We review the home's heating and cooling loads, duct capacity, return air, filter area, venting, electrical circuit, thermostat and comfort concerns.
- Match the system. The furnace, indoor coil, outdoor unit and controls are planned together so each component operates within its design range.
- Complete the work in-house. Our own crews handle the mechanical, refrigeration, venting, drainage and electrical work the project requires.
- Commission both seasons. Furnace temperature rise, cooling airflow, temperature performance, electrical operation, refrigeration procedures, drainage, safety controls and thermostat setup are all verified.
Should You Replace Both Systems or Only One?
Replace both systems when both are near the end of their life or the old coil would not match; replace only one when the other is newer and working well. The recommendation is based on what the house needs, not an automatic package sale.
The other half is newer and still compatible
Replacing one component is the right choice when the remaining equipment is in good condition and can operate properly with the new system.
Both sides are near the same age
When compatibility limits the options or major installation corrections can be completed more efficiently together, a full system often delivers better value.
THE FOUR THINGS WE WEIGH
What each scope actually costs
The price difference between a single replacement and a complete system, including the work that only needs doing once.
The state of both systems
Current condition, repair history and how each half is performing through its own season.
How the parts work together
Refrigerant, coil match, blower capability and control compatibility can limit which combinations are possible.
What the project involves
Duct, venting, electrical and airflow corrections are cheaper and cleaner when completed during a single project.
A Complete-System Approach
Pure Comfort is a family-owned Streamwood HVAC company founded in 2008. Equipment selection matters, but installation quality remains the priority.
- Owner-involved designGene remains involved in system design and quality control while trained in-house crews complete the installation.
- In-house crewsOne team handles the heating, cooling, electrical and duct work rather than coordinating multiple subcontractors.
- Certified experienceLennox Premier Dealer, NATE-certified and EPA-certified experience supports the equipment selection.
- Verified performanceWe confirm sizing, airflow, return-air capacity, filter area, breaker requirements, venting and controls so both systems work together as intended.
Build the Right Heating and Cooling Package
A complete system can combine different furnace stages, blower technologies, AC capacities, efficiency levels and control options. The best package depends on the home’s load, ductwork and the comfort features you value.
Pure Comfort can also evaluate connected upgrades such as filtration, humidity control, zoning and communicating thermostats.
WHAT WE COMPARE FOR YOU
A complete system opens up options a single replacement cannot.
- Furnace staging and blower technology
- AC capacity and operating stages
- Matched efficiency across both systems
- Communicating or standard controls
- Filtration and humidity control add-ons
- Zoning for problem areas of the home
What Financing, Rebates and Warranties Are Available?
Yes. As of October 2026, complete furnace and AC replacements can qualify for 0% APR Lennox promotional financing on select systems, longer terms with interest on projects over $2,000, utility rebates and Lennox warranties. Manufacturer promotions, utility rebates and tax incentives can change, so current eligibility and terms are confirmed during the estimate.
Coordinating the furnace and AC may also simplify equipment registration and warranty planning. Actual coverage depends on the selected models, registration requirements and labor option.
As a Lennox Premier Dealer, we register your Lennox system warranty and add Lennox ComfortShield extended labor coverage of up to 10 years.
0% APR
Up to 60 Months
On select Lennox systems during Lennox promotions. Terms vary by system, subject to credit approval.
Free
Replacement Estimates
In-home, in writing, with no obligation.
Whole-Home Planning in Schaumburg
A Schaumburg homeowner chose Pure Comfort after comparing five HVAC proposals because our evaluation included more than equipment. We investigated airflow, checked attic insulation and found damaged ductwork and missing return-air capacity.
The replacement addressed those system conditions instead of repeating them with new equipment. After installation, the homeowner reported a major comfort improvement. It is a strong example of why complete-system planning begins with the house.
Real Reviews. Real Comfort.
When you need HVAC due to an unexpected event you want someone who not only can provide the service you need….
Great service. Very professional. They try all avenues to resolve issues with equipment. Always a pleasure to work….
Had an issue with the thermostat reading erroneously, as soon as I contacted Pure Comfort, they got back….
Our serviceman, Gene, was very responsive, professional and thorough. He explained each aspect of the issue clearly and….
I called them at 7am with no heat, the only available spot they had was in the afternoon, 5 minutes later they called….
Gene was professional, on-time, very friendly and did a thorough job inspecting our A/C unit. He also checked….
Quick and honest service and advice last minute on a Sunday. Clean crew and equipment. Gene was a knowledgeable….
Gene did not give up on the problem. It was a crazy situation but he never gave up found the problem and fixed it. Thank you….
Furnace wasnt working. Called Pure Comfort after hours and they came right out and helped me. The furnace….
Very professional, definitely knowledgeable had the furnace fixed in 10 minutes. I can honestly say I trusted Gene….
Complete HVAC Replacement FAQs
Should I replace the furnace and AC at the same time?
It can make sense when both systems are aging, compatibility is limited or the project requires shared duct, coil, blower or control changes.
Can I replace only one system?
Yes, when the remaining equipment is compatible and in good condition. We compare both scopes.
How do you size a complete system?
A new system should be sized with a load calculation, not matched to the old unit. The calculation accounts for your square footage, insulation, windows, air leakage and which way the house faces. We don’t just match the size of the old equipment. The same load report sets the heat pump switch-over point on dual-fuel systems.
What does matched equipment mean?
The furnace or air handler, indoor coil, outdoor unit and controls are selected to operate together within manufacturer requirements.
Can IAQ equipment be added during replacement?
Yes. Filtration, humidity control, zoning and thermostat options can be evaluated with the main system.
Do you offer free estimates and financing?
Yes. Replacement estimates are free. For financing, our primary lender is Service Finance, which runs Lennox 0% promotional financing on select systems during Lennox promotions, on approved credit. Longer terms with interest are also available on projects over $2,000 for a lower monthly payment. There are no prepayment penalties.
What installation standards does Pure Comfort follow?
Every full system replacement follows our 49-point checklist, done by our own W-2 technicians. We never subcontract. It covers:
- Gas and venting: gas pipe leak check, flue pipe with 3 screws per joint, PVC intake and exhaust pitched and supported correctly
- Refrigerant: lines brazed with nitrogen flowing, system pressure-tested, vacuum pulled below 500 microns, lines insulated, superheat and subcooling dialed in and recorded
- Airflow: every duct joint sealed, filter rack with a code-compliant cover, blower speeds, tonnage and DIP switches set for your home
- Electrical: correctly sized and labeled breaker, new disconnect, correct wire gauge, low-voltage wiring secured and hidden
- Controls: thermostat programmed and connected to Wi-Fi where supported, refrigerant detection system installed and configured, humidifier set up
- Testing: supply and return temperatures, temperature split on cooling and every heating stage, condensate trapped, pitched and flowing
- Finish: equipment leveled, work area cleaned, photos of model and serial numbers, manuals left with you, a walkthrough and your sign-off
What warranty comes with a new system?
Lennox equipment comes with a 10-year parts warranty, and our office registers it for you and emails you the certificate. Pure Comfort adds a labor warranty of 1 to 10 years, depending on the system package, and Lennox extended labor coverage is always available to buy. Every repair comes with a 1-year warranty on parts and labor.
Is Pure Comfort licensed and insured?
Yes. Pure Comfort is licensed and bonded in every municipality we work in, with our home business license in Streamwood. Our technicians are EPA-certified and NATE-certified, and we’re a Lennox Premier Dealer. We carry workers’ compensation and a $4 million general liability policy. Every technician is our own W-2 employee.
How often should a new HVAC system be serviced?
Twice a year: the furnace in early fall and the air conditioner in spring. Both of our Comfort Club plans include an annual furnace tune-up and an annual AC tune-up, starting at $15 a month.
Complete HVAC Replacement Across the Northwest Suburbs
Based in Streamwood and replacing complete systems throughout the surrounding communities. Pick your town to see local details, or give us a call and we will tell you straight away whether your address is in range.
Not on the list? We cover much of the northwest suburbs, so call and we will confirm your address in a minute.
Plan One System for Every Season
Tell us about both systems and the comfort problems you are dealing with. We will compare complete-system and single-equipment options during a thorough in-home evaluation.
- You get a scheduled window and the technician's name
- We compare full-system and single-equipment scopes side by side
- In-home estimates are free, with no obligation
Not sure which scope you need? Call us at (708) 515-4822 and we will talk through it before scheduling.
Request Service or a Free Replacement Estimate
Rebates you may qualify for
2026 utility programs for Northern Illinois homes. Amounts checked October 2026.
| Program | Equipment | Rebate |
|---|---|---|
| Nicor Gas | Gas furnace, 97%+ AFUE | $225 |
| Nicor Gas | Gas furnace, 95%+ AFUE | $150 |
| Nicor Gas | Furnace + smart thermostat bundle (95% / 97%+ AFUE) | $200 / $275 |
| ComEd | Ducted heat pump, Tier 1 (15.2+ SEER2, 8.1+ HSPF2) | Up to $900 / $1,400* |
| ComEd | Ducted heat pump, Tier 2 (17+ SEER2, 8.5+ HSPF2) | Up to $1,500 / $2,000* |
| ComEd | ENERGY STAR smart thermostat with a heat pump | +$75 |
* Under / over 2.5 tons heating capacity. The federal 25C tax credit ended for systems installed after December 31, 2025. Illinois income-qualified HEAR heat pump rebates (up to $8,000) are not available yet as of October 2026, and projects finished before the program opens will not qualify. We confirm the current status on your written quote. ComEd discounts come off your invoice when a ComEd heat pump-trained contractor installs qualifying equipment. Nicor Gas rebates require qualifying equipment and Nicor’s rebate application. Programs can change, so we confirm what your home qualifies for on your written quote. Programs and amounts can change, so confirm current details on the utility sites before you buy. Official details: Nicor Gas rebates · ComEd heat pump discounts.
Licensed, certified and accredited
- Lennox Premier Dealer
- NATE-certified technicians
- EPA Section 608 certified
- BBB Accredited Business
- Licensed business in the Village of Streamwood
- Registered Illinois LLC
- Fully insured