Furnace Replacement in St. Charles, IL
Free in-home furnace replacement estimates in St. Charles, IL. A new furnace costs $3,000 to $9,500 installed as of October 2026, before Nicor Gas rebates.
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Get a Free New Furnace Estimate in St. Charles
Free in-home replacement estimates from a Lennox Premier Dealer.
- Good, Better and Best options with upfront pricing
- Nicor Gas rebates applied where you qualify
- Financing available, including 0% APR on select Lennox systems during Lennox promotions
- Sized with a load calculation, installed and permitted
Repair Instead of Replace?
If your furnace may be worth fixing, our St. Charles furnace repair team starts with a $75 diagnostic.
- $75 diagnostic ($99 evenings, weekends & holidays)
- 24/7 emergency service, with same-day appointments available
- Trucks stocked with common furnace parts, so most repairs are done in one visit
- Upfront, flat-rate pricing before any work starts
Choosing a New Furnace for a St. Charles Home
Most St. Charles homes date from the 1970s through the 2000s, and many are on their second furnace. Units installed in the 2000s are reaching the age when inducers and control boards fail, so many owners are choosing a furnace for the first time in 20 years. In the large two-story homes on both sides of the Fox River, the furnace has to push air a long way to upstairs bedrooms, and a variable-speed blower helps balance the floors. Original ductwork with small returns is common, so we run a load calculation rather than copying the old size. Older homes near downtown can still have a furnace sharing a chimney with the water heater, and the venting plan for both is part of the replacement.
Furnace Installation in St. Charles: How It Works
It starts with a free visit to your St. Charles home. We measure the house and ductwork, check the venting and gas supply and run a load calculation, then give you written Good, Better and Best Lennox options with rebates and financing laid out. On install day, our own crew removes the old furnace, sets the new one, connects venting, gas, condensate and controls, and tests combustion, temperature rise and airflow before we leave. We register the warranty and walk you through the new thermostat settings.
Repair or Replace Your St. Charles Furnace?
A gas furnace usually lasts 15 to 20 years in the Chicago area. A quick check is the $5,000 rule: multiply the furnace’s age by the repair price. If the result is over $5,000, replacement usually makes more sense. If your St. Charles furnace is younger or the repair is small, a repair may be the better value, and our St. Charles furnace repair team can diagnose it for $75.
Heating Services in St. Charles
Related services for St. Charles homeowners.
New Furnace Cost in St. Charles
As of October 2026, a new furnace from Pure Comfort costs $3,000 to $9,500 installed in St. Charles. Variable-speed blowers for large two-story homes and venting work in older homes near downtown drive most furnace prices in St. Charles. Replacing the furnace and AC together costs $8,000 to $19,000. Every estimate is free and in writing, with Nicor Gas rebates and financing shown before you decide.
| Item | Typical price | What changes it |
|---|---|---|
| Free in-home estimate | $0 | Load calculation and written Good, Better and Best options |
| New furnace, installed | $3,000 to $9,500 | Efficiency, single-stage versus two-stage or variable-speed, venting and return-air work |
| Furnace and AC together | $8,000 to $19,000 | Matched Lennox system with shared labor |
| Nicor Gas rebate | $150 to $225 | Qualifying 95%+ and 97%+ AFUE furnaces |
| Install time | Usually 1 day | Return-air, venting or zoning work can add a day |
| Permit and inspection | Arranged where required | Who files depends on the Village of St. Charles |
| Financing | 0% APR on select Lennox systems | During Lennox promotions; longer terms with interest on projects over $2,000 |
Where a permit is required, we confirm the City of St’s current requirements and pull the permit, or help you file it in towns where the homeowner applies, then schedule any required inspection. Charles requires them.
Why St. Charles Homeowners Choose Pure Comfort
Pure Comfort focuses on clear answers, sound system design and work that holds up after the service truck leaves.
Local and family-owned
Founded in Streamwood in 2008 and still owned and operated by the family who started it.
In-house technicians
Service and installation completed by our own crews, never subcontracted to another company.
Certified and insured
NATE and EPA Section 608 certified, fully licensed and insured for the work we carry out.
Lennox Premier Dealer
Premier Dealer standing, with service and repair covering all major HVAC makes and models.
Not Sure Whether to Repair or Replace?
We will assess the system, explain what we find and help you compare the realistic options for your St. Charles home.
Feedback From Homeowners We Serve
Choosing an HVAC company means trusting the people who enter your home and the work they leave behind. Read recent customer feedback about Pure Comfort’s communication, care and workmanship.
Recent St. Charles installs
Lennox furnaces and air conditioners installed by our team in St. Charles homes.
What St. Charles homeowners say
“Gene and his crew did an excellent job installing a new furnace and air conditioner system. I recommend Pure Comfort in a heartbeat. 6 stars in my opinion.”
Furnace and AC installation
“We recently had Pure Comfort replace our furnace and air conditioner, and we couldn’t be happier with the experience. Their team was exceptionally knowledgeable and professional throughout the entire process.”
Furnace and AC replacement
“Great service and great techs! Pricing was good. Techs arrived at the time quoted. I will use only Pure Comfort anytime I need heat or AC service.”
Service visit
“Fantastic service! Friendly people! Very thorough with their work. Would recommend them to anyone!”
Service visit
“Very satisfied with Pure Comfort. Vince is a very knowledgeable technician.”
Service visit
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….
Furnace Replacement Near St. Charles
Pure Comfort installs new furnaces throughout St. Charles (60174, 60175) and the towns around it, including furnace replacement in South Elgin, furnace replacement in West Chicago and furnace replacement in Elgin. Our shop is in Streamwood, about 25 minutes away, and our own crews handle every install.
Not on the list? We cover much of the northwest suburbs, so call and we will confirm your address in a minute.
St. Charles Furnace Replacement FAQs
How much does a new furnace cost in St. Charles?
As of October 2026, a new furnace from Pure Comfort costs $3,000 to $9,500 installed in St. Charles. Variable-speed blowers for large two-story homes and venting work in older homes near downtown drive most furnace prices in St. Charles. Replacing the furnace and air conditioner together costs $8,000 to $19,000, and Nicor Gas rebates of $150 to $225 apply to qualifying 95% and 97% AFUE furnaces.
How do I get a free furnace estimate or quote in St. Charles?
Call (708) 515-4822 or book online. We visit your St. Charles home, measure the house and ductwork, run a load calculation and give you written Good, Better and Best options with rebates and financing. The estimate is free, and there is no pressure to decide on the spot.
Do I need a permit to replace a furnace in St. Charles?
Where a permit is required, we confirm the City of St’s current requirements and pull the permit, or help you file it in towns where the homeowner applies, then schedule any required inspection. Charles requires them.
Should I choose an 80% or a high-efficiency 96% furnace in St. Charles?
Most St. Charles homes from the 1970s on can take a 96% furnace with PVC venting. In older homes near downtown where the furnace shares a chimney, we include the water heater’s venting in the plan so the 80% or 96% choice reflects the full cost.
How long does a furnace replacement take?
Most furnace replacements in St. Charles take one day. Jobs that add return air, new venting or zoning can take a second day. If you are without heat, tell us when you call so we can schedule the install as soon as the equipment is available.
Is there a furnace replacement company near me in St. Charles?
Yes. Pure Comfort is based in Streamwood, about 25 minutes from St. Charles, and installs furnaces across 60174 and 60175. We are a Lennox Premier Dealer with NATE-certified technicians, and our own crews do every install.
Is it worth replacing a 20- or 30-year-old furnace?
Usually, yes. Most furnaces last about 15 to 20 years in Chicago-area winters. A 20- to 30-year-old furnace is often far less efficient than a new high-efficiency model, parts get harder to find, and heat exchanger problems become more likely. If yours is safe and the repair is small, fixing it can still make sense. In St. Charles, we check the furnace and give you both prices so you can decide.
Schedule a Free Furnace Estimate in St. Charles
Get a careful diagnosis, straightforward options and help from a local HVAC company that stands behind its work.
- You get a scheduled window and the technician's name
- We diagnose and price the work before anything starts
- Replacement estimates are free, with no obligation
Call rather than using the form: (708) 515-4822. Forms are checked during business hours, so a phone call gets you a faster answer.