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Technician kneeling at an open gas furnace in a basement, checking wiring for furnace repair in Littleton, CO.

24-hour emergency line

Furnace Repair in Littleton, CO

The thermostat says 64 and dropping, the blower is running, and the air coming out of the vents is colder than the room. At 5,400 feet a Littleton house loses heat quickly once the burners stop, and on a January night the pipes in the crawl space feel it before you do.

Call us. A licensed, insured technician finds the actual fault, tells you what it costs, and does not start until you say go.

Furnace repair across Littleton, Centennial, Highlands Ranch and Englewood since 2020. No-heat calls go to the front of the queue.

Request Service (720) 731-0663

Google reviews4.9 from 426 Google reviews

No heat right now? Call us. Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours

Common problems

Furnace problems we fix

Tell us what your furnace is doing. We will diagnose the cause and explain the repair before any work starts.

Homeowner in a winter coat feeling a cold floor vent at night, a no-heat call for emergency furnace repair in Littleton

Furnace blowing cold air

Short answer: a furnace blows cold air when the burners are not lighting, or they light and a safety control shuts them down again, most often the flame sensor, the igniter or the gas valve.

The blower runs but the air is cold. The burners are not lighting, or they light and drop out within a minute. We test the flame sensor, igniter and gas valve, and tell you which one failed before anything is replaced. If the failed part is one we carry, the repair is normally done on the same visit.

Attic gas furnace with the panel off, showing the control board and wiring we test when a furnace won't turn on.

Furnace won't turn on

Short answer: most furnaces that will not start have lost power or their call for heat (a flipped furnace switch, a tripped breaker or a dead thermostat battery), and the rest trace to the control board, transformer or thermostat wiring.

Nothing at the vents. No click, no sound. Check the furnace switch on the wall beside the unit and the breaker in your panel first. Both get knocked off by accident. If they are fine, the fault is deeper: control board, transformer or thermostat wiring. That is when you call us.

Hand pulling a dirty pleated filter from a furnace, a common cause of short cycling we check on furnace repair calls.

Furnace keeps shutting off

Short answer: a furnace that starts and stops repeatedly is short cycling, usually because restricted airflow or a blocked flue is overheating it and a limit switch is shutting it down to protect the heat exchanger.

It runs a few minutes, stops, starts again. That is short cycling and it will not fix itself: usually a clogged filter, a blocked flue, or a limit switch tripping on overheat. We find which one and clear the cause instead of resetting it.

Worn and new furnace blower motors side by side with a wrench, the usual fix for a squealing blower in furnace repair.

Furnace banging or squealing

Short answer: a bang on startup usually means delayed ignition, and a squeal usually means the blower motor bearing. Neither is normal and both get worse.

A bang on startup is usually delayed ignition: gas building up before it lights. A squeal normally means the blower motor bearing. Both get worse. Delayed ignition is the one worth calling about this week, not next month.

Yellow flex gas connector and black-iron drip leg on an attic gas furnace, checked on a gas smell furnace repair call.
Safety

Burning or gas smell

Short answer: a dusty burning smell on the first run of the season is normal and clears within an hour. A gas smell never is. Leave the house and call the gas utility from outside before you call anyone else.

Across Littleton and the south metro that utility is Xcel Energy, and its gas emergency line is 1-800-895-2999. Call 911 first if you are already outside and the smell is strong. Once the property has been made safe, we check the heat exchanger, burners and flue before we call a furnace safe to run.

Our services

Furnace and heater repair services in Littleton

Older gas furnace with the front panels off, showing the draft inducer, gas valve and control board during furnace repair.

Furnace repair

Furnace stopped, or running and not heating? We diagnose the real fault (igniter, flame sensor, blower motor, control board, limit switch, pressure switch, gas valve or draft inducer) and give you the repair price before work starts. Gas and electric, including Carrier, Trane, Lennox, Goodman, Rheem, Bryant, York and Amana.

Most of what we open up here is a gas upflow furnace in a basement or a utility closet, either an 80% AFUE unit venting into the chimney or a 90%-plus condensing unit with its own PVC vent and a condensate drain. Which one you have changes where the fault usually sits, so we check the venting and the drain as well as the box.

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Technician measuring airflow at a floor heat register during furnace service in Littleton, CO, with snow outside the windows.

Furnace service

Furnace running, but something is off? Uneven heat, a gas bill that jumped, a noise you have started listening for. We find the cause while it is still a service call and not a no-heat call in January.

Furnace service in Littleton 

Smiling technician testing flue gas with a combustion analyzer as the burners fire during furnace maintenance in Littleton.

Furnace tune-up

Furnace still working fine? Get the burners, flame sensor, safeties and combustion checked before the heating season, and the filter changed while we are there. Most no-heat calls in winter start as something visible in October.

Furnace tune-up in Littleton 

New high-efficiency gas furnace with white PVC venting and a sealed plenum in a basement after a furnace replacement.

Furnace replacement

Been told you need a new furnace? Get a second opinion first. When a repair still makes sense we say so. When it genuinely does not, we size the replacement for this elevation, not off the label.

Furnace replacement 

Brands we service
  • Carrier
  • Trane
  • Lennox
  • Goodman
  • Rheem
  • Bryant
  • York
  • Amana
Technician kneels by a homeowner, pointing to the burners of an open furnace during furnace service in Littleton, CO.
Attic furnace with the blower assembly out and the control board hanging free, partway through a furnace repair.
Price firstNothing starts until you say go

How it works

How a repair call works

Four steps, start to finish.

  1. 1

    You call.

    Tell us what the furnace is doing, not what you think is wrong. "Blower runs, air is cold." "Nothing at all." That one sentence narrows the fault before anyone leaves.

  2. 2

    We book a real window.

    Based on what is already on the board, not "sometime Tuesday". No-heat calls below freezing go first, same day where the schedule allows.

  3. 3

    We diagnose, then quote.

    A licensed, insured technician runs the unit and finds the fault. You are told what has failed, what it takes to fix, and what it costs, before anything is touched. Nothing starts until you say go.

  4. 4

    We fix it and test it.

    Where the part is one we carry (igniters, flame sensors, capacitors, limit switches, thermostats), the repair finishes on the visit. A blower motor or control board may need ordering, and you get told that day, with a date. The furnace runs through a full cycle before we leave.

  • Dispatcher in a headset taking notes at her desk as a homeowner calls to book furnace repair in Littleton, CO
  • Technician with a tool bag greets a homeowner at a snowy front door, arriving for furnace repair in Littleton, CO
  • Gloved technician testing a gas furnace control board with a multimeter to find the fault during furnace repair in Littleton
  • Thermostat set to 70 degrees with the heat icon lit, the final check after furnace repair in Littleton, CO
Technician with a tool bag shakes hands with a homeowner at the door on a snowy day for furnace repair in Littleton, CO

What Your Neighbors Are Saying About Us

Excellent 4.9 out of 5 stars 426 reviews
Kevin H.3 weeks ago

Our furnace stopped working right before a cold weekend. They responded quickly, explained the problem clearly, and had our heat back on the same day. Great experience.

Amanda P.6 weeks ago

Great company to work with. Scheduling was simple, communication was good, and the furnace service was completed without any problems.

Rachel M.2 months ago

Booked a furnace tune-up before winter. The technician was thorough and pointed out a few small things we could watch for. Very professional service.

Megan P.3 months ago

We recently moved to Englewood and needed our furnace checked before winter. They were helpful, honest, and easy to work with.

Tyler B.4 months ago

Needed a new furnace installed before winter. The team helped us understand our options and completed the job faster than expected.

Jason R.5 months ago

We replaced an older furnace in our Highlands Ranch home and the whole process was easy. The installation team was respectful, efficient, and cleaned up afterward.

Jennifer C.7 months ago

Had a great experience with their furnace installation team. They arrived on time, worked carefully, and left everything clean.

Melissa C.8 months ago

Excellent furnace repair service. The technician arrived when promised and quickly found the issue. Our system has been running smoothly since then.

Adam T.9 months ago

Our furnace replacement went smoothly. From the estimate to installation, everyone was helpful and professional.

Nicole R.10 months ago

Very happy with the furnace tune-up. The technician was friendly, explained what was checked, and answered all my questions.

Brian F.1 year ago

I called after noticing unusual furnace noises. They checked everything carefully and gave honest recommendations without trying to sell unnecessary work.

Daniel C.1 year ago

Our furnace failed during a cold night in Centennial. They were able to come out quickly and get everything working again. Really appreciate the fast response.

Chris D.14 months ago

Quick furnace repair and excellent communication. The technician arrived prepared and fixed the issue without wasting time.

Laura M.18 months ago

Professional from beginning to end. We had our old furnace replaced and the crew made the entire process simple.

Steven W.2 years ago

The technician was knowledgeable and explained the repair in a way that actually made sense. Good service and fair pricing.

Eric S.2 years ago

Reliable furnace service and friendly staff. I would definitely call them again for future heating needs.

Stephanie B.2 years ago

Good experience overall. They completed the furnace service professionally and helped us understand the maintenance needed going forward.

Mark E.2 years ago

Excellent work on our furnace tune-up. The appointment was easy to schedule and the technician arrived right on time.

Rebecca H.3 years ago

I appreciate the honesty and attention to detail. They inspected our furnace and gave us clear options instead of pushing unnecessary repairs.

Olivia S.3 years ago

After struggling with an unreliable furnace, we decided to replace it. The new installation was smooth, and our home feels much more comfortable now.

Pricing

What furnace repair costs in Littleton

  • Diagnostic call: $89 – $150, credited against the repair if you go ahead
  • Most repairs in this area: $150 – $800
  • After-hours emergency: Extra call-out charge, quoted on the phone before we come
Technician holds a flame sensor and emery cloth by an open gas furnace, a small job in furnace repair in Littleton, CO

The range is wide because the parts are. A flame sensor is a small job. A blower motor or a control board is not. You get the exact figure after the diagnosis and before the work. That order is the whole point.

What we will not do

  • Quote before diagnosing
  • Start work you have not approved
  • Sell you a replacement when a repair will do

Every technician we send is licensed and insured.

Technician reviews the repair price on a tablet with a homeowner at a kitchen counter for furnace service in Littleton, CO.
Snowy brick ranch home at dusk, lit windows and mountains behind, a home we reach for emergency furnace repair in Littleton.

No heat right now?

No heat in freezing weather can become a safety problem, not just a scheduling one. Pipes in exterior walls, crawl spaces and unheated areas freeze before the living space becomes unbearable.

No-heat calls go to the front of the queue. Our emergency line runs 24 hours. Call it and you get a realistic time based on what is already booked, not a promise nobody can keep.

Emergency furnace repair in Littleton 

Technician with a tool bag walks to a snowy home at dusk from our van, for emergency furnace repair in Littleton, CO

Emergency line 24 hours

(720) 731-0663

Mon–Fri 7am–9pm · Sat–Sun 8am–6pm

Call now

Before you call

What to check before you call

Four checks, two minutes. We would rather you try them than pay for a visit you did not need.

  1. The furnace switch. Looks like a light switch, on the wall or joist beside the unit. It gets flipped during cleaning and nobody remembers doing it.
  2. The breaker. Reset the furnace breaker once. If it trips again, stop and call. That is an electrical fault, not a nuisance.
  3. The thermostat. Set to HEAT, set above room temperature, and check the batteries.
  4. The filter. Hold it up to a light. If no light comes through, it is heavily restricted and needs replacing. A blocked filter overheats the unit.

If all four check out, the fault is inside the furnace. That is the call to make.

(720) 731-0663
Aging gas furnace in a basement corner with spare filters beside it: what to check before you call for furnace repair.
Homeowner with a flashlight checking the furnace switch and breaker panel before calling for furnace repair in Littleton

Local know-how

Furnace repair at Littleton's altitude

5,400 ftLittleton elevation, roughly

Littleton sits at roughly 5,400 feet, so gas furnaces need the correct high-altitude setup to operate properly. A furnace that isn't adjusted for the elevation may run longer, struggle to heat your home, or lose performance on colder nights.

We check the manufacturer's installation requirements and verify that the furnace is correctly set up for Littleton's elevation, rather than relying on a generic rule of thumb.

What we check on a furnace at altitude

  • 1Flame sensor: can cause the furnace to shut down after ignition.
  • 2Draft inducer: problems can affect ignition and safe operation.
  • 3Blower motor: can cause weak airflow or unusual noises.
  • 4Air filter: restricted airflow can lead to overheating and short cycling.
Parts behind common furnace repairs: igniter, flame sensor, capacitor, pressure switch, limit switch and inducer motor.
Flashlight on the blue burner flames of a gas furnace, checking the altitude setup during furnace repair in Littleton, CO

If your furnace runs but your home still isn't getting warm, we'll find out why before recommending a repair.

Sources: ACHR News · Johnson Controls high-altitude conversion manual · Trane and Lennox installation manuals

Service areas

Furnace repair across Littleton and nearby communities

Whether you are in central Littleton, Ken Caryl, Centennial or Highlands Ranch, we diagnose the furnace on site, explain what has failed and give you the price before work starts.

The neighbourhood usually tells us something before we arrive. Around Ketring Park and the streets near Historic Downtown Littleton the housing is older: ranch homes from the late 1950s and 1960s, where the furnace is rarely the original but the ductwork and the flue often are. Southpark, built in the early 1980s, and the Columbine Hills and Westridge Glen side of town are typically on their second furnace by now, which is the age where blower motors and control boards start failing. Newer build-out south toward Chatfield and past C-470 tends to run condensing units, where the faults are more often in the venting and the condensate drain than the burners.

We cover 14 residential ZIP codes in the south Denver metro: Arapahoe, Douglas and Jefferson counties.

Furnace Repair Pros van in a snowy driveway below the foothills, ready for furnace repair in Littleton, CO and nearby towns
Red brick ranch home with a carport, snow and mountains behind, the kind we serve for furnace repair in Littleton, CO.

Littleton

  • 80120
  • 80121
  • 80122
  • 80123
  • 80125
  • 80127
  • 80128

From Columbine and Ken Caryl across to Santa Fe Drive, along Bowles Avenue and South Broadway, and south past C-470 toward Chatfield. Greenwood Village and Cherry Hills Village sit inside the same run, so a call from either is a normal appointment rather than an out-of-area one. If your furnace is in one of those ZIP codes, we can get to it.

Snowy south metro homes with the foothills beyond, the neighborhoods we cover for furnace repair in Littleton, CO

FAQ

Frequently asked questions

Technician shows a homeowner a worn igniter by the open furnace, explaining the fault during furnace repair in Littleton

Still have a question?

Call and tell us what the furnace is doing.

(720) 731-0663

Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours

What are the signs my furnace needs repair?

Short answer: the common warning signs are short cycling, cold air from the vents, new banging or squealing, a burning smell that does not clear, a yellow burner flame instead of blue, and a gas bill that jumps without a change in the weather.

Short cycling, cold air from the vents, banging or squealing, a burning smell that does not clear, a yellow burner flame instead of blue, or a sudden jump in your gas bill. Any one of those is worth a call.

Is there a reset button on my furnace?

Short answer: some furnaces have one, usually on the blower housing, and it is designed to be pressed once. A furnace that trips again has a fault the reset will not clear.

If your furnace has a manufacturer-provided reset button (usually a small red or yellow button on the blower housing), follow the instructions printed on the unit and reset it once. If it trips again, something is causing it, the reset is not the fix, and that is the point to stop and call.

What usually goes wrong with a furnace?

Short answer: flame sensors and igniters fail most often, followed by blower motors, capacitors, limit switches and control boards.

Common faults include flame sensors, igniters, blower motors, capacitors, limit switches and control boards. A dirty filter contributes to plenty of them, by restricting airflow and overheating the unit.

Should I repair or replace a 25-year-old furnace?

Short answer: it depends on the part, not the age. A small repair can be worth doing on a furnace that old; a cracked heat exchanger usually is not.

Twenty-five years is past the normal service life of most gas furnaces. A cheap repair on a unit that old can still be the right call for one more winter, while a major heat-exchanger repair changes the repair-versus-replace conversation entirely. We will tell you which one you are looking at.

Can a furnace make you sick?

Short answer: yes, a cracked heat exchanger can put carbon monoxide into the house. Headaches, dizziness or nausea that improve when you leave and return when you come back are the warning sign, and the safe response is to leave and call from outside.

A cracked heat exchanger can put carbon monoxide into the house. Headaches, dizziness or nausea that get better when you leave and come back when you return are the warning sign. If you suspect it, leave and call from outside.

What do I do while I wait for the technician?

Close the doors of rooms you are not using, open curtains on south-facing windows while there is sun, and keep a tap trickling if temperatures are below freezing. Do not use a gas oven or grill for heat.

Still have a question?

Call and tell us what the furnace is doing.

(720) 731-0663

Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours

Smiling technician in a dark polo shirt pointing to the side, one hand in his pocket, for furnace repair in Littleton, CO

Ready to get the heat back on?

Call and tell us what the furnace is doing. We will diagnose the fault, give you the price, and fix it once you approve it.

Request Service (720) 731-0663
Furnace Repair Pros · 2679 W Main St, Suite 300, Littleton, CO 80120

Mon–Fri 7am–9pm · Sat–Sun 8am–6pm · Emergency line 24 hours

  • Licensed and insured
  • Financing available
  • 24/7 emergency service
  • Warranty
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