Furnaces
Furnace Services in Elgin & the Fox Valley
No heat, strange noises or a furnace that won’t stay lit? We diagnose and repair every major brand. When replacement makes more sense, we size a new high-efficiency furnace to your home and take your CY2026 Nicor Gas discount right off the invoice.
- 24/7 no-heat emergency service
- All brands repaired
- NATE-certified in gas heating installation
- Nicor Gas Contractor Circle member
Furnace Services
Pick the page that matches your situation. Every one covers what we check, what it costs and what to expect.
24/7 no heat
Furnace Repair
No heat, short cycling, a furnace that clicks but won’t light. Every brand, flat-rate price before work.
Fall tune-up
Furnace Maintenance & Tune-Ups
Combustion analysis, heat exchanger inspection and safeties, on their own or as part of the $240 plan.
CY2026 Nicor discounts
Furnace Replacement
When repair stops making sense: the 50% rule, efficiency jump and the CY2026 Nicor Gas discount off the invoice.
NATE-certified
Furnace Installation
Sizing to the house, AHRI matching, venting and commissioning done to code, permit filed where requested and required*.
Any hour
Emergency Furnace Repair
What counts as an emergency, what to do right now and what to check before you call.
Heat pump + furnace
Dual-Fuel Systems
A heat pump for most of the winter with your gas furnace as backup, and both utility discounts.
Signs Your Furnace Needs Attention
Most furnace breakdowns give some warning first. Call us if you notice any of these.
- No heat, or not enough heat
- The blower runs but the air is cold
- Short cycling on and off
- Banging, squealing or rattling noises
- Rooms that never warm up
- A yellow or flickering burner flame
- Frequent resets or error codes
- Gas bills climbing with no change in use
Smell gas? Leave the house right away, call 911 from outside, and call your gas utility’s emergency line from outside before calling us.
Repair, Replace or Maintain
A failing igniter and a cracked heat exchanger call for very different repairs — we diagnose first and give you honest repair-vs-replacement pricing before you decide.
Any brand
Repair
We test the ignition, flame sensor, pressure switches, blower and venting, find the actual failure and fix it with the price approved up front.
Free quotes
Replace
For older, unreliable or unsafe furnaces, we quote a right-sized replacement, pull the permit where requested and required* and haul the old unit away. Most changeouts are done in a single day.
$240 / year
Maintain
A fall clean and check keeps the burners, heat exchanger and safety controls in shape before you need heat every day.
What a Furnace Replacement Includes
A new furnace is only as good as the installation behind it.
An Amana gas furnace with an AprilAire air filter, installed by our team.
- Sizing based on your home, not the old unit’s label
- High-efficiency Amana gas furnaces
- Venting, gas line and condensate done to code
- Permit filed under our own license where requested and required*
- Smart thermostat options, including qualifying ENERGY STAR models
- Old equipment removed and hauled away
- CY2026 Nicor Gas instant discount applied at installation
Paying over time? Prequalify in about 2 minutes with no impact to your credit score.
Save With CY2026 Nicor Gas Instant Discounts
As a Nicor Gas Contractor Circle Installing Member, we take the discount right off your 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’s $275 or $200. See CY2026 Nicor Gas instant discounts.
Thinking about a heat pump with your furnace as backup? CY2026 ComEd and Nicor Gas discounts each apply to their own equipment. See heat pumps.
Furnace Repair & Replacement Across the Fox Valley
Based in Elgin, we serve homes throughout Kane, McHenry, DuPage and DeKalb counties.
- Elgin
- South Elgin
- St. Charles
- Aurora
- Bartlett
- Streamwood
- Huntley
- Plato Center
- Sycamore
- Carpentersville
- West Dundee
- East Dundee
- Algonquin
- Gilberts
- Hampshire
- Pingree Grove
- Campton Hills
- Geneva
- Batavia
- Barrington
- Hoffman Estates
- Schaumburg
- Burlington
- Marengo
- Wayne
- Sleepy Hollow
Don’t see your town? Call (847) 224-2420. View all service areas.
Furnace Repair & Replacement FAQs
How long does a gas furnace last?
A residential gas furnace typically lasts 15 to 20 years. Regular maintenance helps it reach the upper end of that range.
Should I repair or replace my furnace?
It depends on the furnace’s age, the cost of the repair, its safety and how well it’s been keeping up. We’ll give you an honest recommendation and a price for both options.
How long does a furnace replacement take?
Most residential furnace changeouts are done in a single day.
Do you offer emergency furnace repair?
Yes. No-heat calls are answered 24/7 at (847) 224-2420.
Do you repair furnaces you didn’t install?
Yes. We repair and maintain all major brands of gas furnaces, no matter who installed them.
Can I finance a new furnace?
Yes. You can prequalify in about 2 minutes with no impact to your credit score, and your CY2026 Nicor Gas discount lowers the amount you need to finance.
No Heat? We’re On It.
Call any time for emergency furnace repair, or book a repair, tune-up or free replacement quote online.
Planning a replacement? Request a free quote or see financing options.
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.
