Furnace Replacement in Elgin, IL
Furnace Replacement in Elgin, IL: Free Written Quotes, Nicor Gas Discount Applied
Old furnace, big repair quote, or a cracked heat exchanger? We replace it with a right-sized, high-efficiency Amana gas furnace, file the City of Elgin permit under our own license when a permit is requested and required*, haul the old unit away and take the CY2026 Nicor Gas instant discount off the invoice. Our shop is on Muirhead Road in Elgin, and most changeouts are finished in one day.
- Free, written quote with the Nicor Gas discount already subtracted
- City of Elgin Heating Contractor License 26-00034970
- Old furnace removed and hauled away
- Most changeouts done in one day, with heat the same evening
- Office hours 8 a.m. to 5 p.m., Monday through Friday; no-heat calls answered 24/7
Repair or Replace? A Straight Answer
Not every old furnace needs to go. When we look at a furnace in an Elgin home, we price the repair and the replacement on the same visit and tell you which one we would pick for our own house.
The starting point is the 50% rule: if a repair costs more than half of what a new furnace would, replacement usually wins. Then age breaks the tie. Under 10 years, repair it. Between 10 and 15, small repairs make sense, but a blower, control board or inducer deserves a replacement quote next to the repair price. Past 15 years, and certainly past 20, most large repairs are money spent on borrowed time. A cracked heat exchanger ends the conversation at any age, because it can let carbon monoxide into the air you breathe.
15 to 20 years
Age
A gas furnace typically lasts 15 to 20 years. Past that, parts get harder to find and one worn part usually sits next to two more.
Over 50%
Repair cost
Common furnace repairs in the Elgin area run about $300 to $1,800. When the quote climbs toward the top of that range on an old furnace, compare it to a new one.
2 to 3 repairs
Repeat failures
Two or three repairs in the last couple of winters usually means the furnace is wearing out as a whole, and the next failure is coming.
80% AFUE
Gas bills
On an 80% furnace, roughly one in five dollars goes up the flue. A 97% AFUE furnace burns about 17% less gas for the same heat.
Want the repair numbers first? See what furnace repair costs in Elgin, or book furnace repair. No heat tonight? Call (847) 224-2420 or see 24/7 emergency HVAC repair in Elgin.
What Elgin Homes Need From a New Furnace
Elgin is our home base, so we see the same few situations again and again. Here is how they change a furnace replacement.
An old 80% furnace sharing a flue with the water heater. Many older Elgin homes still have an 80% furnace venting into a metal flue it shares with the water heater. A 95% to 97% condensing furnace vents on its own through new PVC intake and exhaust piping, usually out the rim joist, and drains condensate. With the furnace gone from the flue, we reline or resize it so the water heater still vents safely on its own. This is the most common replacement we do.
Split-levels and two-story homes with uneven rooms. A single-stage furnace is either off or at full blast. A two-stage or modulating Amana furnace with a variable-speed blower runs low and steady most of the time, which evens out the temperature between floors. That is a comfort problem a repair never fixes.
Older, historic neighborhoods and converted upper units. Some Elgin properties, including multi-family buildings and homes that predate forced air, have no room for standard ductwork. In those cases a furnace may not be the right answer at all, and a ductless mini-split or a compact air handler fits the building better. We look at the building before we recommend equipment.
Thinking about a heat pump. In northern Illinois the best answer is often both: a cold-climate heat pump for most of the season with a new gas furnace as backup on the coldest days. Each side qualifies for its own utility discount. See dual-fuel heat pump and furnace systems.
A furnace sized to the house, not the old label. Many older furnaces were oversized, which causes short cycling and uneven rooms. We size the new furnace to your home, and a Manual J load calculation is available on request.
Licensed and Bonded With the City of Elgin
A furnace replacement involves gas, venting and electrical work. In Elgin, that work is done under a City license you can look up yourself.
- City of Elgin Heating Contractor License 26-00034970, so we can file the Elgin permit under our own number when a permit is requested and required*
- Surety Bond 66947798 on file with the City, which gives you and the City recourse if work goes wrong
- A permitted job gets inspected, so the gas line, venting, electrical disconnect and condensate drain are done to code because someone from the City is going to look at them
- Warranty registered in your name at installation, so the terms are in force from day one
More on our local credentials, rebates and other services on the Elgin, IL service-area page.
How a Furnace Replacement Goes in Elgin
You will have heat again the same day on almost every changeout.
1
Free in-home quote
We measure the house and look at the ducts, venting, gas line and electrical, talk through two-stage versus modulating and whether a heat pump makes sense, and leave a written quote with the discount already subtracted.
2
Old furnace out
The crew lays down floor protection, shuts off gas and power, disconnects the old furnace and removes it. If it shared a flue with the water heater, that flue is relined or resized.
3
New furnace in
The new furnace is set and leveled, with sheet metal transitions, PVC intake and exhaust, a new gas shutoff and drip leg, the condensate drain and trap, and a dedicated electrical connection.
4
Commissioning
Gas pressure, combustion analysis, temperature rise and static pressure are measured and recorded on the invoice. Then we walk you through the thermostat and filter, and register the warranty.
Most single-furnace changeouts take one working day. Adding a heat pump, moving the furnace or running new ductwork can add a day. For the full detail on sizing, venting and startup, see furnace installation and furnace replacement.
What Furnace Replacement Costs in Elgin
One written price, no surprise add-ons, and the Nicor Gas discount figured before you sign.
We don’t publish a single installed price, because the same furnace costs different amounts in different basements. The price depends on the furnace’s size and stage, the efficiency tier, the venting work, whether the ductwork or gas line needs changes, and the permit. The quote is free and in writing, so you can compare it with any other Elgin HVAC company’s.
The Nicor Gas discount. As a Nicor Gas Contractor Circle Installing Member, we take the CY2026 instant discount right off the invoice: $225 on a furnace rated 97% AFUE or higher, or $150 at 95% AFUE. Add a qualifying smart thermostat on the same invoice and it becomes $275 or $200. There is no rebate form and no waiting for a check. See Nicor Gas instant discounts.
Financing. You can prequalify in about 2 minutes with no impact to your credit score, and the discount lowers the amount you finance.
Comparing quotes. A fair furnace quote is sized to your house, not copied off the old nameplate. It names the equipment being installed and shows any Nicor Gas or ComEd discount already applied, rather than added on as a surprise later. If a quote does not show those three things, ask for them.
Why Elgin Homeowners Choose Rest Assured for a New Furnace
A local Elgin company, based on Muirhead Road, with credentials you can check.
- High-efficiency Amana gas furnaces in two-stage, modulating and variable-speed options, with AprilAire filtration and humidification available
- Our qualified and experienced technicians are EPA 608 Universal and NATE certified in AC and gas heating installation
- Nicor Gas Contractor Circle Installing Member and ComEd Heat Pump-Trained Contractor, so discounts come off the invoice
- BBB of Chicago & Northern Illinois Complaint Free Award, 2024 and 2025
- Elgin Area Chamber of Commerce member
- 24/7 emergency service if the old furnace fails before replacement day
Keep the New Furnace Running: Maintenance Plan
Our semi-annual maintenance plan is $240 a year: a fall furnace tune-up and a spring AC or heat pump tune-up, each up to a $130 value, plus one free business-hours service call, priority scheduling and 5% off services. It keeps the new furnace running the way it did on day one.
Furnace Replacement FAQs for Elgin
How much does a new furnace cost in Elgin?
It depends on the furnace’s size, stage and efficiency, the venting work and the permit, so we don’t publish a single price. Quotes are free, written and show the CY2026 Nicor Gas instant discount already subtracted, and you can prequalify for financing in about 2 minutes with no impact to your credit score.
Do you pull the City of Elgin permit for a furnace replacement?
Yes. Pulling a permit is the homeowner’s responsibility, but ask us and we file it under City of Elgin Heating Contractor License 26-00034970 when the City requires one for the work.
How much is the Nicor Gas furnace discount in 2026?
$225 on a furnace rated 97% AFUE or higher, or $150 at 95% AFUE. Add a qualifying smart thermostat on the same invoice and it becomes $275 or $200. We take it off the invoice at installation, with no forms to mail.
How long does a furnace replacement take?
Most single-furnace changeouts are done in one working day, and you will have heat that evening. Adding a heat pump, moving the furnace or running new ductwork can add a day.
Can I replace an old 80% furnace with a high-efficiency one in an older Elgin home?
Yes, and it is the most common replacement we do. A condensing furnace needs new PVC intake and exhaust piping, usually out through the rim joist, and a condensate drain. If the old furnace shared a metal flue with the water heater, we reline or resize that flue so the water heater vents safely.
What brand of furnace do you install?
We install Amana gas furnaces, with AprilAire filtration and humidification options. We repair and replace all major brands.
What if my furnace dies before you can replace it?
Call (847) 224-2420 any time. We will get you safely through the night with a repair where possible, and if replacement is the answer we can usually install within days.
Should I add a heat pump when I replace my furnace?
Often, yes. A cold-climate heat pump handles most of the season and the new furnace takes over on the coldest days. Each side qualifies for its own CY2026 utility discount, ComEd on the heat pump and Nicor Gas on the furnace.
Ready for a New Furnace in Elgin?
Get a free written quote with the CY2026 Nicor Gas discount already figured in, or call and we’ll come out to measure. Office hours are 8 a.m. to 5 p.m., Monday through Friday, and no-heat calls are answered 24/7.
See all Elgin HVAC services or contact us.
Discount amounts reflect the 2026 Nicor Gas Energy Efficiency Program for qualifying equipment installed January 1 through December 31, 2026, and are subject to change or cancellation due to funding limits. Rest Assured HVAC LLC is an independent contractor and is not affiliated with or endorsed by Nicor Gas.
*Pulling a permit is the homeowner’s responsibility. Ask us to, and we’ll file it under our own license wherever the local jurisdiction requires one for the work.
