HVAC reviews in Longmont, Colorado

After dealing with too many heating emergencies and spending cold days without heat in Longmont, we decided it was time to find a furnace repair company we could trust for regular maintenance—not just when something went wrong. We wanted to avoid future problems and keep our heating system running smoothly, especially with how chilly it gets here. Reaching out to this company was a great choice. The person who answered the phone was clear about the costs and helped us schedule a service quickly. Our technician, Connor, arrived right on time and was friendly, knowledgeable, and willing to explain everything. We have a Viessmann furnace, which needs special attention, and Connor knew exactly what to do. He even discovered that one of the parts had a recall, got in touch with the manufacturer for us, and arranged for the repair to be covered at no extra charge. While he was here, he also took care of some small issues we hadn’t even noticed. We are really happy with the service and the peace of mind that comes from having a reliable furnace repair company looking after our home. Highly recommend!

After having an urgent issue with our air conditioning system at home in Longmont, we first called another HVAC company for an emergency repair. They did get the AC running again, but it stopped working just a few days later and the service was really expensive. That’s when we reached out to this HVAC company, and Maurice came by to help us out. Maurice not only fixed the problem the first company missed, but he also went the extra mile by checking the outdoor unit just to be sure everything was safe. During his inspection, he found that the previous technician had used the wrong refrigerant in our system, which could have caused serious safety issues for our family. Thanks to Maurice’s careful work, the system was safely shut down and thoroughly cleaned out. The service was top-notch, the pricing was much more reasonable, and we really appreciated the attention to detail. We feel much safer and will definitely trust them for all our air conditioning and HVAC needs from now on.

I had my AC and heating system installed in Longmont a while back at a fair price and with great service. Recently, I called to schedule a regular maintenance check because I noticed some noise coming from the fan—turns out the nut holding the fan in place had come loose. Jason, the technician who helped me, quickly figured out that I was eligible for a complimentary first service visit and confirmed that my furnace was still under warranty. After carefully inspecting the fan motor and noticing signs of wear, he suggested replacing it under the warranty, which I appreciated. Jason was very professional, honest, and friendly throughout the visit. During a routine system check, he also took the time to explain what he was doing and answered all my questions. I was really happy with the service and would definitely recommend them for AC repair and maintenance in Longmont.

I recently had ComfortFlow HVAC Repair come out to my home in Longmont to replace my old AC unit. Terry and Jason, the technicians, did an excellent job installing the new air conditioning system. They were very professional, explained the whole process ahead of time, and kept me updated as they worked. While installing, they even found and fixed a couple of problems from the old setup to make sure everything was up to code and running safely. Connor, who helped me choose the right system for my home, made sure I understood all my options. Overall, I’m really happy with the service and would recommend them to anyone needing AC repair or installation in Longmont.

We needed to replace our old heater, so we reached out to a few companies for quotes. After comparing, we chose ComfortFlow HVAC Repair. Connor came to our home in Longmont, checked our heating system, and gave us honest advice without pushing extra services. We decided to get a new furnace, added a humidifier, and upgraded our old ductwork to new insulated metal ducts. The team was professional, finished the heater installation right on schedule, and everything works perfectly. We’re very happy with the results and would definitely recommend their heater repair and installation services to anyone in Longmont needing help with their heating system.

We had a fantastic experience with this HVAC company. Maurice was very professional, knowledgeable, and hardworking throughout the whole process. When our air conditioner stopped working, Maurice made sure we stayed comfortable by getting our system running until the new AC unit arrived. He also took the time to inspect both our furnace and AC, and explained that our current equipment and ductwork weren’t sized properly for our home, which was making it harder to keep cool. We were worried that replacing everything would be too expensive, but the pricing was very reasonable and fit our budget. If you’re looking for honest, reliable HVAC service from someone who cares about doing the job right, this is the company to call. Highly recommended!

When my mom’s furnace stopped working and her house dropped to around 40 degrees, we needed help fast. We called for emergency HVAC service in Longmont, and Maurice arrived that same evening to diagnose the issue. He was very friendly, patient, and explained everything clearly so we understood the problem. Maurice even offered to provide us with temporary space heaters to keep my mom comfortable. Early the next morning, we received a call with three different quotes and the offer to install a new heating system right away. Maurice and Jason came out for the installation. They worked quickly, took great care with my mom’s home, and answered all my questions about the new furnace and how to use the thermostat. I am really impressed by how responsive and professional the team was. Their fast service, reasonable prices, and payment options made everything easy, especially during one of the coldest days we’ve had. I highly recommend this company in Longmont for any furnace repair or installation needs!

I can’t say enough good things about the team that helped with our heater repair in Longmont. Our old furnace kept having trouble starting up, so I called early one morning while heading to work. Maurice answered the phone and remembered talking with me before about possibly replacing our old unit. Within just a few hours, a technician showed up and carefully explained what was wrong with the furnace. After seeing the issues, I decided it was the right time to replace the furnace, AC, and thermostat all together. Jason came by to review the previous estimate and discuss all the new options available. By the next day, the new equipment was installed and working perfectly! Everyone on the team was friendly, on time, efficient, and made sure to explain everything in detail—from equipment choices, pricing, warranties, and how they determine the right size system for your home, to what to expect during installation. The installers did a great job cleaning up after themselves too, so it looked like nothing had even happened. It’s not easy to find this level of skill and professionalism these days. If you’re in Longmont and need heater repair or a new HVAC system, I highly recommend reaching out to this team.

The technician, Maurice, arrived right on time and was very professional, walking me through the AC repair work he completed and what might be needed down the road. I really appreciated how he kept everything tidy and cleaned up the area after he finished. Later, Connor was great at explaining exactly what was going on with my air conditioner and made sure I understood how they would handle the final repairs. Terry also did an excellent job, taking extra time to show me how to use the new thermostat and answering all my questions. The whole team that installed the new furnace and compressor worked efficiently and really knew their stuff. The office staff was also super helpful and friendly whenever I called. I'm really happy with my AC repair experience in Longmont!

I would recommend Karl and his team to anyone. They've replaced 2 furnaces and a swamp cooler for me, and have worked alongside me on a handful of other projects. They are always prompt, friendly, and professional. They produce good work at reasonable rates. I plan to have them back this fall to replace my boiler.

I've used KJ Thomas for the past 2 years now for services, minor repairs and most recently a furnace replacement. They've always been reliable, professional and on time, and took their time to explain what they were doing and why. I'm no HVAC expert but their work looks good quality as far as I can tell. I would recommend them.

Our air conditioning service was done so efficiently and quickly. Daisha was great and so friendly offering tips for us to do and what to schedule next. Thanks so much!

KJT removed an aging Furnace & A/C and installed a new dual-fuel Furnace & Heat pump system (re-used my humidifier). They removed old infrastructure and used all new, properly sized supply and return paths, and routed existing pipes, wires, etc to create a more compact install than the original. As soon as they walked in the door, they protected all exposed hardwood and carpet flooring and made sure to completely remove all old materials, packing, etc. Daisha was there for 2 days working alongside Ken as a great asset to Ken's team, executing all phases of the install, answering questions, and cleaning up at the end of the day.

I rec'd quotes from other larger companies in town. Their young "Sales Advisors" knew how to auto-generate a proposal, but didn't really seem to understand the whole picture. And it would have been different techs doing an install later. With KJT it was personalized; Ken visited to see my home, made a proposal, visited again to answer all questions and refine the final plan, and then led the install process a week or 2 later.

Overall, I received very personalized and professional service, and the experience from 1st phone call to installation completion was top-notch.

Quick, easy and painless as one always hopes for when it comes to routine maintenance. Cooper was polite and courteous.

They were able to install a new furnace the next day after being called. Installation was the day before Thanksgiving, and they stayed until past 7 pm until the system was fully working. Their estimate was competitive with other HVAC firms. They do excellent work, and care about the results.

Our boiler stopped working altogether, during a cold spell no less. Anne was great...she was very sympathetic and scheduled their senior boiler tech, Brad, to come out asap and diagnose the problem. Seems there were some wires and an electrical relay that were "fried". He got us up and running just in time before a big snowstorm and another sub-zero cold front hit. Brad was totally respectful, knowledgeable, and professional. (Also, as 2 seniors, we appreciated that he was fully vaccinated and wore a KN95 mask while working in our house.)
Highly recommended ...Thanks both to Anne, in the office, and Brad, the boiler tech! We will definitely use them again, and refer our neighbors as well. Five stars! *****

Professional, timely, courteous - what more can we say? From beginning to end our experience has been so easy. We needed a repair recently on an installation KJ Thomas did a few years ago and they were literally here the next day! So happy!!!!

Daisha is amazing and did a great job! Told me what she did and why! She was on time and very friendly! I will continue to use this company in the future! Thank you KJ Thomas Mechanical!

We have used KJT for around 20 years. They installed new heating and air conditioning in our home. Excellent service knowledgeable technicians. Honest, ethical and trustworthy. KJT came out last week and serviced our system. First rate. Trane is a great brand. It's quiet and inexpensive to run. Our heating bills have gone way down. They are the best.

Had furnace issues on a new furnace, with the initial installer. KJ Thomas were responsive, polite, professional and most of all were able to diagnose and resolve the issue which is a lot more than I can say for the initial installer. Would highly recommend, everyone I spoke with was a delight to talk to by comparison to others in the industry. A+

Excellent service by this company. They repaired our furnace to our full satisfaction. Another company was not able to do this and only wanted to sell us a new device. So we switched to KJ Thomas Mechanical and are very happy about their highly professional and friendly service. Most importantly for us they have a sustainable approach which I guess many others will appreciate as well.