Serving Littleton since 2020
Furnace Replacement in Littleton, CO
Old furnace, or told you need a new one? Get a second opinion first.
A furnace replacement is a big decision, and it should not rest on one quick look at the unit. Sometimes the old furnace really is done. Sometimes it needs one part and another winter.
Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours
- Second opinion firstRepair when a repair still makes sense
- Set up for 5,400 ftInput rate per the installation manual
- Permit by addressCity or county building department
- Licensed and insuredThe technician who looks at your furnace
Second opinion
A second opinion before a new furnace
We look at the furnace and the house first, tell you which it is, and quote a replacement only when a replacement is the right call.
Being told "you need a new furnace" is not the same as needing one. A technician runs the furnace, finds what has actually failed, and tells you what it takes to fix it.
If the answer is a repair, you get the repair and the price. If the answer is replacement, you get the reason in plain words: what failed, why fixing it is not worth it, and what a new furnace would change.
A diagnostic call typically runs $89 to $150.
If you have no heat right now, start here instead: emergency furnace repair.
One part, or a new furnace?What the second opinion answers
Repair or replace
When a repair still makes sense
A repair usually makes sense
- The furnace is well inside its working life
- One part has failed and the rest of the system checks out
- It is the first real repair in years
- The heat is even and the gas bill has not crept up
A replacement is worth pricing
- The furnace is near or past 15 to 20 years, the typical life of a gas furnace
- Repairs are stacking up, one winter after another
- A major component has failed on an older unit
- The heat exchanger is cracked, which is a safety problem, not a repair
- The house has never been comfortable, even with the furnace running properly
If it is a close call, we say so, and the decision stays yours.
Sizing
Sized for the house, set up for 5,400 feet
A new furnace should be sized to the house, not copied from the label on the old one.
The square footage, the insulation, the windows and the ductwork decide what the house needs.
A furnace that was never set up for this elevation can run below its rating for years, and a bigger replacement is not the fix for that.
Sized to the houseNot to the old label
5,400 ftLittleton elevation, roughly
The input rate is set for the elevation
Littleton sits at roughly 5,400 feet. A gas furnace installed here has to have its input rate set for the elevation, and that is the installer's job. Manufacturers disagree on exactly where to start counting, so the model's own installation manual governs.
On some models that means a high-altitude kit: a different pressure switch, gas valve springs and burner orifices.
Permits: city or county, depending on the address
A furnace replacement requires a mechanical permit from the local building department. A straightforward repair normally needs none.
Colorado licenses HVAC work through local jurisdictions rather than at state level, so the permit comes from the city or county your address sits in. The 14 ZIP codes we cover run across Arapahoe, Douglas and Jefferson counties, and a Littleton mailing address does not always mean the City of Littleton.
In Highlands Ranch, for example, the permit comes from the Douglas County Building Division, not the metro district: furnace repair in Highlands Ranch.
Ask who is pulling the permit before work starts.
Which call
Which call do you need?
| Your situation | The call to book |
|---|---|
| No heat, or a gas or CO concern | Emergency furnace repair |
| It runs, but something is wrong | Furnace service |
| Old furnace, repairs stacking up, or told you need a new one | Furnace replacement: this page |
The job
What happens on a replacement job
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We look first.
A licensed and insured technician runs the old furnace, checks what has failed, and looks at the venting, the gas line and the ductwork it connects to.
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The answer and the quote.
Repair or replace, and why. If it is a replacement, you get the price for your home before anything is ordered.
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Old out, new in.
The new unit is connected to the gas line, the venting and the ductwork, and its input rate is set for the elevation per the installation manual.
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We run it and check it.
The new furnace runs a full heating cycle before we leave. The permit inspection follows the install.
Pricing
What affects the cost
- Diagnostic call$89–$150Repair or replace, answered first
- ReplacementQuoted on siteAfter we see the home and the existing unit
- Before any workPrice firstNothing is ordered until you say go
A replacement is quoted after we have seen the home and the existing unit. These are the things that move the number:
Size of the furnace, from what the house actually needs.
Efficiency. A high-efficiency condensing furnace vents through PVC pipe and needs a condensate drain, which an older unit may not have had.
Venting, ductwork and plenum changes where the new cabinet does not match the old flue and connections.
Altitude setup the model's manual calls for.
The permit, and how easy the furnace is to reach.
The diagnostic call typically runs $89 to $150. Everything after that is quoted first, and nothing is ordered until you say go.
Every technician we send is licensed and insured.
Service area
Areas we serve
Littleton, Centennial, Highlands Ranch, Englewood, Greenwood Village and Cherry Hills Village: 14 residential ZIP codes across Arapahoe, Douglas and Jefferson counties.
Still weighing it up? We keep plain-language guides on repair or replace and on how long a furnace lasts.
FAQ
Frequently asked questions
Do I really need a new furnace?
Not always. If you have been told the furnace needs replacing, a second opinion shows whether one repair would buy it more winters. We tell you what failed and what it takes to fix it before anyone prices a new unit.
How long does a gas furnace last?
Gas furnaces typically run 15 to 20 years. Age alone is not the reason to replace one. An older furnace that runs well and needs a small repair can still be worth keeping.
Do I need a permit to replace a furnace?
Yes. A furnace replacement needs a mechanical permit from the local building department, which depends on whether the house sits inside a city's limits or in unincorporated Arapahoe, Douglas or Jefferson County. Ask who is pulling it before work starts.
Why does the altitude matter for a new furnace?
At roughly 5,400 feet there is less oxygen in the air, which changes how the gas burns. The installer sets the new furnace's input rate for the elevation, following the model's installation manual.
How much does a furnace replacement cost?
It depends on the size, the efficiency, the venting and what the house needs, so we quote it after seeing the home and the existing unit. A diagnostic call typically runs $89 to $150.
Told you need a new furnace?
Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours
Old furnace? Get a second opinion.
We tell you whether a repair still makes sense, and quote a replacement only when it is the right call.
Furnace Repair Pros · 2679 W Main St, Suite 300, Littleton, CO 80120