Best Furnace Repair Companies in Flagstaff, AZ
Furnace Repair in Flagstaff: NATE certification + gas safety
Furnace repair is gas + combustion work — credentials carry more weight than for AC. NATE certification and EPA 608 are the baseline. Here is what each of the 8 providers below publishes: In Arizona, HVAC work requires an active ROC license (R-39 or KA-39 class) — verify the number on roc.az.gov before signing.
Top picks
Fiscor Plumbing and Air
Furnace Repair score: 4.9
Vouched Score: 90/100
Gas-furnace service specialist. NATE Certified with 1-hour Emergency.
- NATE: ✓
- Emergency: 1-hour
- Flat-rate: ✓
- Free estimates: ✓
- Maintenance: ✓
- Years: 20+
What customers say about furnace repair
…Carlos got it turned off, checked the controls, and remedied the horrid situation quickly. Then, on Sunday, January 18th, I woke up to NO HEAT. I called Fiscor, telling them that my furnace was not running, and it was about 59° in my house…
The furnace in our home went down and of course that week the temps we in the teens. I called Fiscor and they set up an appointment the very next day to trouble shoot the system. Justin, our tech, was very helpful and he determined that due to the system being almost 25 years old that it was at the end of life, parts could no longer be acquired and was potentially dangerous due to a few cracks that could leak CO2, which can be common with older systems…
Google 4.8★ (190+)
- Years: 30+
Consistently strong customer feedback (4.8★ from 175+ Google reviews). Specific NATE / EPA credentials not published — confirm by phone.
What customers say about furnace repair
This company is by far the most honest, considerate, and helpful HVAC company in Flagstaff and the surrounding areas. We had our furnace stop working one night - one of the coldest nights this year. We called one company, they came out, spent 5 minutes looking at the system and said it was installed wrong and needed a full replacement. The second company came out, spent 20 minutes looking at the system, said the motor needed replacement and the owner told his employee to upcharge us 4x the price…
Our furnace went down and they worked us in the following morning. Benjamin was great! Diagnosed the problem and replaced our thermostat. Thank you Campbell’s
Google 4.8★ (175+)
- Free estimates: ✓
- Years: 15+
What customers say about furnace repair
…I spoke with Frank the owner, and his son Adam was able to come out the very next day. He quickly diagnosed the issue, and instead of jumping to suggest a full replacement (which we were bracing for), he said he believed he could fix it with a new part. Because of the age of our furnace, they had a difficult time locating the part, and found one available in a shop in California which took about a week to order. But as soon as it arrived, they installed it promptly and had our system running again in no time…
Papa Charlie's is the absolute BEST in town, no questions. Frank and his son are always incredibly professional, kind, and easy to work with. We have had them come to our home and our business on several occasions. From fixing a furnace that died on New Years Eve, repairing it before the sun could even set, to installing industrial air conditioners for our Veterinary clinic…
Google 4.9★ (40+)BBB A+
- NATE: ✓
- EPA 608: ✓
- Free estimates: ✓
- Years: 75+
What customers say about furnace repair
Mother-in-laws' heater went out Monday night. 18 degrees. Called Boyer Tuesday at 10:30am. 33-year-old furnace was shot. They provided space heaters by 1pm. New furnaced installed and operating 26 hours after initial call. Superior service and very fair price. Thank you guys!
When we needed a new furnace we asked around at work, and the vast majority recommended Boyer. We called them, and they were able to install a new until a few days later. We had one weird problem with noise, and they sent someone out within the hour, who quickly identified and fixed the problem. Furthermore, they called the next day to make sure the problem had been solved to our satisfaction. So, yes, it's been a good experience.
Google 4.2★ (25+)BBB A+
- Flat-rate: ✓
- Free estimates: ✓
- Years: 20+
What customers say about furnace repair
…This time Stephanie was her usual friendly, efficient, and professional self. She always manages to get everyone coordinated to get the job done and her customer service is wonderful. Trevor and Isaac installed our new furnace quickly and efficiently. Their knowledge came through in the speed and ease in completing the job on time and professionally. They were very knowledgeable and friendly and helped us a lot in deciding which furnace to choose and then making the installation seem easy…
Google 4.8★ (25+)
- Years: 10+
Consistently strong customer feedback (4.9★ from 25+ Google reviews). Specific NATE / EPA credentials not published — confirm by phone.
What customers say about furnace repair
We have lived in our home for 22 years the HVAC System was installed when we built the home. 12 years into the life of the system the furnace failed and was replaced. For the entire time we have lived in the home we have struggled with multiple rooms being 8 to 10° cooler than the rest of the home. We finally decided that it was time to replace the entire system. We checked multiple companies here in town and down in the Prescott Valley to replace our system. A very good friend recommended Qtech here in Flagstaff. I immediately contacted the company and spoke with the owner Ricardo…
Hayden and Henderson were awesome! Got my new furnace up and running same day. Very thankful for Q Tech and the guys!
Google 4.9★ (25+)
- Emergency: same-day
- Free estimates: ✓
- Years: 30+
What customers say about furnace repair
Needed to replace my A/C unit and furnace. Eduardo explained all the options that suit my square footage. He went over everything and I didn’t feel pressured. I’m happy with the outcome and that he was able to answer all my questions. Great Customer Service, Great Unit and I recommend Ace Heating & Cooling & Plumbing. Thanks again Eduardo.. appreciate it!
Google 4.9★ (305+)
- Years: 15+
Consistently strong customer feedback (4.9★ from 50+ Google reviews; BBB grade A+). Specific NATE / EPA credentials not published — confirm by phone.
What customers say about furnace repair
I can’t say enough great things about Comfort Systems of Arizona! I called right before Christmas when our heat went out, and they fit us in that same day. The technician was professional, kind, and went above and beyond to make sure we had heat and were comfortable for the holidays. They took the time to explain how our system works, answered all our questions, and even put us on a maintenance schedule to keep everything running smoothly…
Cole and Dustin were outstanding! They were at my door exactly at 8:30 as promised and went to work so quickly - removed my old furnace and installed a new Trane and made it look easy. So patient as I looked and asked questions. These guys know what they are doing - absolutely delighted! You are in good hands with Comfort Systems.
Google 4.9★ (50+)BBB A+
Typical Furnace Repair costs in Flagstaff, AZ (2026)
Last updated
Estimated ranges for Flagstaff, AZ. Actual cost varies with home size, equipment, and scope — always request a written quote for your job.
| Service | Typical range |
|---|---|
| Furnace repair | $110–$595 |
| Ignitor or flame sensor replacement | $170–$425 |
| Heat exchanger inspection (CO safety check) | $130–$300 |
| Heat exchanger replacement (repair-vs-replace inflection) | $1,300–$3,000 |
Why do HVAC service demand spikes occur across Flagstaff every season?
- When is a furnace problem an actual emergency vs. a next-day call?
- Carbon-monoxide alarm, smell of gas, or visible cracks in the heat exchanger → emergency. No-heat in sub-freezing weather is urgent but rarely safety-critical. Most no-heat calls are igniter, flame sensor, or gas valve — same-day fixable.
- What's the difference between a flame-sensor clean ($120) and heat-exchanger replacement ($1,500+)?
- Flame sensors clog with combustion residue and stop signaling the gas valve — quick clean or swap. Cracked heat exchangers leak CO into your home airflow and require exchanger replacement (often impractical) or full furnace replacement. The tech's CO meter reading decides which one you're facing.
- Do Flagstaff HVAC companies require specific state-level licensing for residential installations?
- Yes, every HVAC contractor in Flagstaff must hold an active license issued by the Arizona Registrar of Contractors (ROC). This state-mandated requirement ensures that technicians are properly bonded and carry the necessary workers' compensation insurance. Before hiring a professional for your home, always verify their specific license status through the ROC database to ensure they meet the regulatory standards for residential trade work in Arizona.
- When is the most critical time to schedule a furnace inspection in Flagstaff?
- The most critical time to schedule a heating system inspection is during the late summer or early autumn months, well before the first major freeze. Because Flagstaff experiences extreme temperature fluctuations at high altitude, equipment often fails during the first cold snap of the season. Scheduling maintenance early helps ensure your system is calibrated for the upcoming winter, preventing the need for an emergency HVAC service in Flagstaff when demand is at its peak.
- How do I find a specialist for high-efficiency heat pump systems in Flagstaff?
- When searching for HVAC services in Flagstaff, look for providers who maintain specific manufacturer-dealer designations and demonstrate advanced technical training in high-altitude heat pump performance. Top-rated providers often highlight their certifications for modern, energy-efficient equipment on their websites or in their service profiles. Reviewing customer feedback for mentions of successful heat pump installations or repairs in your specific neighborhood can also help you identify contractors with the specialized experience required for these complex units.
- Typical HVAC pricing in Flagstaff, AZ: what should I budget?
- Furnace repair typically runs $110–$595, and heat exchanger replacement runs $1,300–$3,000 in Flagstaff, Arizona. See the HVAC pricing table on this page for the full per-service breakdown.