Same-Day Service
Most service calls handled same-day across the Denver metro — and we answer the phone 24/7.
Furnace Repair Service
Fast, Honest Furnace Repair for Denver Homeowners
When your furnace stops working in the middle of a Colorado cold snap, you need a company that answers the phone, shows up quickly, and tells you the truth about what’s wrong and what it costs to fix it. Done has been doing exactly that for Denver homeowners since 1999. Our technicians are licensed, carry a broad stock of common repair parts on the truck, and are trained to diagnose problems accurately on the first visit — so you’re not paying for a second trip.
Whether your furnace won’t ignite, is blowing cold air, keeps cycling on and off, or has simply stopped responding to the thermostat, we can troubleshoot and repair all major makes and models. For situations that can’t wait, our emergency heating repair service is available 24 hours a day, seven days a week, including holidays.
- 24/7 Emergency Response Furnaces don't fail on a schedule. Done answers calls day and night, including weekends and holidays, and dispatches technicians across the Denver metro when you need help most.
- Accurate First-Visit Diagnosis Our technicians arrive with diagnostic tools and a well-stocked truck so we can identify what's wrong and handle most repairs without a second appointment.
- Upfront, Flat-Rate Pricing You'll know exactly what your repair costs before we start. No hourly billing surprises — just a clear number you can say yes or no to.
Common Furnace Problems
Signs Your Furnace Needs Repair
Denver winters are not forgiving when your heating system is struggling. These are the most common warning signs homeowners call Done about — some are obvious, and some are easy to miss until the system fails completely.
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Blowing Cold or Lukewarm Air
If your furnace runs but the air coming from your vents isn't warm, the problem could be a failed igniter, a dirty flame sensor, a tripped high-limit switch, or a gas supply issue — all repairable by a trained technician.
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Short Cycling — Turns On and Off Repeatedly
A furnace that kicks on, runs briefly, then shuts off before your home reaches temperature is short cycling. Common causes include an overheating heat exchanger, a clogged filter, or a malfunctioning flame sensor.
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Unusual Noises — Banging, Squealing, or Rattling
A well-running furnace should be relatively quiet. Banging on startup can indicate a dirty burner with delayed ignition. Squealing often points to a worn blower belt or motor bearing. Rattling may mean loose panels or a compromised heat exchanger.
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Furnace Won't Turn On
Before you call, check your thermostat settings, circuit breaker, and furnace power switch. If those check out and the system still won't respond, the issue is likely an igniter failure, a control board problem, or a safety lockout that needs a technician to clear.
What We Repair
Furnace Repairs Done Handles
Done's technicians are trained and equipped to repair all major furnace components and systems across gas furnace brands common to Denver-area homes.
- Igniter & Flame Sensor Replacement Hot surface igniters and flame sensors are among the most common furnace failure points. We stock these for most major brands and can typically complete the repair in a single visit.
- Control Board & Thermostat Diagnosis A faulty control board can mimic several other problems. We use proper diagnostic tools to confirm whether the board is the issue before recommending replacement — and we check thermostat wiring and calibration at the same time.
- Blower Motor & Capacitor Repair The blower motor moves heated air through your home's ductwork. When it fails — or when the run capacitor that starts it weakens — airflow drops and your furnace works harder. We repair or replace both.
- Heat Exchanger Inspection A cracked heat exchanger is a safety issue, not just a performance one — it can allow combustion gases to enter your living space. Done inspects heat exchangers carefully and gives you an honest assessment of whether repair or replacement is the right call.
How We Work
What Happens When You Call Done for Furnace Repair
We keep the repair process transparent and efficient. Here's what Denver homeowners can expect from the first call to a working furnace.
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Call Us Anytime — 24/7
Dial 833-539-9153 any time of day or night. A real person answers, takes your information, and dispatches the nearest available technician to your Denver-area home.
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Technician Arrives Promptly
We'll give you an arrival window and call or text when the technician is on the way. Our vans are stocked with the parts most commonly needed for furnace repairs so we're ready to work when we arrive.
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Diagnosis & Upfront Quote
The technician diagnoses the problem thoroughly, explains what's wrong in plain language, and gives you a flat-rate price before touching anything. You approve the repair — or don't. No pressure either way.
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Repair Completed & Tested
Once you approve, we complete the repair and run your system through a full operational test — checking ignition, heat output, airflow, and safety controls — before we pack up and leave.
Current Specials
Save on the work your home needs most.
Why Choose Done
Upfront Pricing
Flat-rate pricing approved before work begins — no surprises on the invoice.
Licensed & Insured
Fully licensed, bonded, and insured — plumbing, HVAC, and electrical under one roof.
Satisfaction Guaranteed
If it isn't right, we make it right — backed by our workmanship guarantee.
Furnace Down in Denver? Call Done Now.
Our technicians are available 24/7 — including nights, weekends, and holidays. One call and it's handled.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
4/4/2024 My Carrier furnace was reflecting an error code. I contemplated calling a furnace company that was offering a great deal for first time clients. I contacted Done Plumbing and Heating instead since they have done all my other plumbing needs as well as initially installing my Carrier furnace and air conditioner. I am so thankful I did contact Done. Jay Mitchell came out within hours of my call for service. He diagnosed the problems and then went over and beyond by verifying my warranty with Carrier for the replacement of the necessary part. He took the time to verify the labor warranty reflecting on my paperwork should have reflected 10 years not 1 year and ensure me that the part and labor were all covered. He was knowledgeable enough to catch the error on warranty coverage on the labor on my paperwork which someone with less experience would not have. He was professional, personable, and kind enough to answer all my questions. He returned early the next day with the replacement part, installed the part, and completed a diagnostic check to confirm all was well with my furnace. He made me feel very valued as a Done customer and reflected kindness in answering all my questions. He gets a 5-star rating with me and he is an asset to Done as an employee. He cemented my commitment to use Done for any needs I have for any repairs or replacements that they can provide in the future. Thank you so much Jay. You certainly made my year and saved me a ton of money by verifying my warranty.
Chad was awesome he reconfigured the pipe exiting the house for the sump pump so it didn’t drain on the sidewalk and added a coupling so I could remove the pipe when I mowed. He understood what I said and his people skills were fantastic. Chad was back to repair the outside spigot on 5/11/2022. Once again he provided a 5 star service. 4/27/23 garbage disposal service was awesome. Quick and cheap. Service providers gave me great info to keep my disposal clean and operating smoothly. As usual Done got it done
Chad was awesome he reconfigured the pipe exiting the house for the sump pump so it didn’t drain on the sidewalk and added a coupling so I could remove the pipe when I mowed. He understood what I said and his people skills were fantastic. Chad was back to repair the outside spigot on 5/11/2022. Once again he provided a 5 star service. 4/27/23 garbage disposal service was awesome. Quick and cheap. Service providers gave me great info to keep my disposal clean and operating smoothly. As usual Done got it done
★★★★★
Prompt service, no hidden commuter charges, prices quoted on site following inspections. Justin snaked a clogged sewer line successfully. Jeremy (and Austin) assessing the cause of the back up were excellent in estimating further repairs.
Ben on the HVAC side of Done Plumbing & Heating did an outstanding job addressing a host of immediate and persistent issues with our furnace. The series of issues took a few days to resolve, such as compensating us for a wrong part being installed in our furnace by a peer, installing the correct parts, and diagnosing a persistent short cycling problem as due to a thick coat of dust and dog hair build up in A/C coil area that tripped the high limit. It was curious that: (a) I don't own pets since at this residence, and; (b) the company I'd employed for 3 years to "maintain and clean" my furnace didn't catch it during "annual service." Yet, Ben caught it and removed what was a sizeable mound caking/choking the furnace and over working the blowers within an hour of one day... Need I say more! And, is the other company in trouble?!
Today, Neil came to troubleshoot the cause of a loud water heater motor and probably solved the issue with a tank flushing. Plus, he provided comprehensive explanations and quotes for replacement/installation.
Ben on the HVAC side of Done Plumbing & Heating did an outstanding job addressing a host of immediate and persistent issues with our furnace. The series of issues took a few days to resolve, such as compensating us for a wrong part being installed in our furnace by a peer, installing the correct parts, and diagnosing a persistent short cycling problem as due to a thick coat of dust and dog hair build up in A/C coil area that tripped the high limit. It was curious that: (a) I don't own pets since at this residence, and; (b) the company I'd employed for 3 years to "maintain and clean" my furnace didn't catch it during "annual service." Yet, Ben caught it and removed what was a sizeable mound caking/choking the furnace and over working the blowers within an hour of one day... Need I say more! And, is the other company in trouble?!
Today, Neil came to troubleshoot the cause of a loud water heater motor and probably solved the issue with a tank flushing. Plus, he provided comprehensive explanations and quotes for replacement/installation.
★★★★★
Nov 2017 - Once again we called Done for help. Thanks so much for the 3 crews that worked on our plumbing and heating problems. They were prompt, courteous, professional and worked hard on all the issues, advising what was going on each step of the way. They were a pleasure to work with. Gavin and Jacob came initially for preventive maintenance on our corroded kitchen pipes and to fix a leaking bathroom faucet. They also assessed a sewer problem and spotted a leak coming from the furnace. Jason and Jacob corrected the sewer line problem the next day. We appreciated Jason’s work attitude and ethic (so sincere) as well as his sense of humor. Thomas fixed the leak in the furnace and prevented a major problem down the road.
We discovered our backed up drain on 12/30/16. Lincoln came the next morning, determined the problem and fixed it so we could get the rest of it cleaned up. He was professional and personable, knew what he was doing. What a way to start a new year, but we were glad Done came to our rescue.
December 2, 2022 - Vincent came out and was done in about an hour to clear out sewer lines for preventive maintenance. He inspected 4 toilets and found the access to the sewer line in the furnace room. He removed and then replaced tables, chairs and other items that were blocking the access. After he was done, he moved everything back into place. He was friendly and helpful. It was a pleasure to work with him.
We discovered our backed up drain on 12/30/16. Lincoln came the next morning, determined the problem and fixed it so we could get the rest of it cleaned up. He was professional and personable, knew what he was doing. What a way to start a new year, but we were glad Done came to our rescue.
December 2, 2022 - Vincent came out and was done in about an hour to clear out sewer lines for preventive maintenance. He inspected 4 toilets and found the access to the sewer line in the furnace room. He removed and then replaced tables, chairs and other items that were blocking the access. After he was done, he moved everything back into place. He was friendly and helpful. It was a pleasure to work with him.
Maintenance Membership
Join the Care Club
Total home service care, on a schedule.
Members get priority scheduling, seasonal HVAC tune-ups, an annual plumbing & electrical safety inspection, and exclusive discounts — for less than the cost of a single emergency call.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Frequently Asked Questions
How much does furnace repair cost in Denver?
Furnace repair costs vary based on what’s failed and what parts are needed. Minor repairs like a flame sensor cleaning or igniter swap are typically on the lower end. Control board replacements or blower motor failures cost more. Done uses flat-rate pricing, so you’ll know the exact cost before we begin — no hourly billing, no surprise fees after the fact.
Is it worth repairing an older furnace or should I replace it?
A good rule of thumb is the repair-versus-replace calculation: if the repair cost exceeds 50% of what a new furnace would cost, and your system is over 15 years old, replacement usually makes more economic sense. Done’s technicians will walk you through both options honestly. We don’t push replacements when a repair is the right call — and we don’t push repairs when the system is at the end of its life. See our furnace installation page for more on what a replacement involves.
Do you offer emergency furnace repair?
Yes. Done is available 24 hours a day, 7 days a week, including weekends and holidays. If your furnace stops working on a cold Denver night, call 833-539-9153 and we’ll get a technician to you as quickly as possible. Learn more on our emergency heating repair page.
My furnace turns on but the house won't warm up. What's wrong?
If the burner is firing but the temperature isn’t rising, common culprits include a severely clogged air filter restricting airflow, a failing blower motor that isn’t moving heated air through the ducts, ductwork leaks, or in some cases a heat exchanger problem. Start by checking and replacing a clogged filter — it’s the one thing homeowners can address before calling. If that doesn’t help, call Done and we’ll diagnose the rest.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
