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Best heating and air conditioning pros near Longmont, CO

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  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon541
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Longmont - Updated Nov 2026

Avatar for M & H Air, LLC
M & H Air, LLC
5.0(
18
)
Central A/C - Service or RepairGas Furnace / Forced Air Heating System - InstallCentral A/C - Install+14 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2001

Free estimates

Credit card accepted

"I had an excellent experience with this HVAC company. Their team was highly professional, knowledgeable, and focused from start to finish. They took the time to explain everything clearly, completed the work efficiently, and demonstrated great attention to detail. It’s refreshing to work with a company that values quality, expertise, and customer service. I highly recommend them to anyone looking for reliable HVAC professionals."
M & H Air, LLC
Victory Outreach Church
2 neighbors recently requested a quote
Avatar for Behold Heating & Cooling Services
Behold Heating & Cooling Services
4.9(
47
)
Central A/C - Service or RepairGas Furnace / Forced Air Heating System - RepairThermostat - Repair or Reprogram+2 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"I had a great experience from start to finish with this company. They were able to install my new AC unit quickly, which I was thankful for, considering how hot it has been. Throughout the entire process, they were transparent with their pricing, explained everything clearly, and never made me feel pressured. Dylan and Tristan were incredibly knowledgeable, professional, respectful, and kind. They took the time to answer all of my questions and made sure I understood what was being installed and why. I was honestly pretty stressed about having to replace my AC unit, but they made the entire experience easy and worry-free. I would absolutely recommend this company to anyone looking for honest, reliable HVAC service. Their customer service and quality of work exceeded my expectations, and I couldn't be happier with the experience."
Boiler Repair/Replacement
Boiler Replacement and Repipe
Boiler Replacement and Repipe
Furnace, AC, Water Heater Replacement
Furnace Tune-up

+35

Response time6 hrs
Response rate100%
83 neighbors recently requested a quote
Avatar for Mountain Pro HVAC Services, LLC
Mountain Pro HVAC Services, LLC
5.0(
126
)
Central A/C - Service or RepairElectric Furnace / Forced Air Heating System - RepairElectric Furnace / Forced Air Heating System - Repair - For Business+4 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"Our furnace wasn't working one evening and they came out after hours to help troubleshoot the problem. He gave us the option to pay a warehouse opening fee and have it fixed that night or do it first thing when they opened in the morning. He also identified some other issues with our furnace that was hurting efficiency that he fixed while he was there. Great service and will definitely call them again with any HVAC problems I have."
Maintenance Services
Maintenance Services
Maintenance Services
Maintenance Services
New AC / Furnace Install

+4

Response time11 hrs
Response rate92%
Recommended by100%of homeowners
Avatar for One Hour Heating & Air Conditioning - Loveland
One Hour Heating & Air Conditioning - Loveland
4.7(
208
)
Air Ducts & Vents - Clean

Serving Longmont, CO and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1978

Free estimates

Emergency services offered

"Brian, the HVAC technician was professional, friendly and extremely knowledgeable, he provided a full estimate before starting the work and then performed the repair immediately. We were back up and running in minutes. Well Done 1 hr team."
4 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for HighPoint HVAC
HighPoint HVAC
5.0(
23
)
Air Ducts & Vents - Clean

Serving Longmont, CO and surrounding areas

Approved

Credit card accepted

"Highly recommend Owen?s company! We scheduled to clean our Air Ducts and the results were incredible! I?ll definitely use them again. If you looking for good quality & honest work, you can?t do better than HighPoint HVAC"
2 neighbors recently requested a quote
A-Moonlight Heating & Air Conditioning
5.0(
52
)
Central A/C - Service or RepairGas Furnace / Forced Air Heating System - Repair

Serving Longmont, CO and surrounding areas

Approved

In business since 2014

Emergency services offered

Warranties offered

"Quickly worked out a long term problem from an incorrect furnace installation by another installer. Corrected the problem at a very fair price. They are now my preferred HVAC company."
Response time3 hrs
2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Your Comfort Heating and Cooling
Your Comfort Heating and Cooling
5.0(
19
)
Ductless Mini-split A/C - Install or ReplaceDucts & Vents - Install or ReplaceGas Boiler or Radiator Heating System - Repair+8 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"We had two AC units and a new furnace installed they were prompt, efficient, very respectful and great customer service! Dean was an absolute pleasure to work with, they have earned my business for life on any HvAC services I might need! Highly recommend"
New Amana Furnace
New Amana Heat Pump
High Efficiency
Outside Condensers
two new condensers

+3

Response time2 hrs
Response rate98%
18 neighbors recently requested a quote
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Heating and Air Conditioning FAQs, answered by experts

The difference between a home surge protector and an HVAC surge protector is that an HVAC surge protector is designed to protect the components inside your HVAC unit while a home surge protector is installed near appliances and meant to protect your entire home. There are three tiers of whole-house surge protectors, and they are more expensive to install than HVAC surge protectors.

You will only need to refill your AC with refrigerant if it has a leak. Otherwise, a modern, well-maintained AC will most likely never need a recharge. You may notice a leak in an older system if your bills are higher, you hear a hissing sound, or if the air is blowing out hot.

Yes, mini-split systems are generally less expensive to run than central air conditioners and are significantly more energy-efficient. Because mini-splits do not rely on ductwork, they avoid the energy loss associated with ducted systems, allowing cooled or heated air to reach its destination more efficiently. Additionally, they offer zoned control, meaning you can run units in individual rooms and turn them off in unoccupied areas. This capability can lead to energy savings of about 30% compared to a central air system, resulting in a lower monthly energy bill.

The best way to reduce heat upstairs is to release it by opening a window. Hot air rises, and if you can create some airflow by opening a window upstairs and also one on a lower level, the hot air should be pushed out of the home. Remember that fans pointing out the window do a much better job of circulating air than fans pointing into the home.

Assessing location for airflow, convenience, and minimal noise impact.

The Longmont, CO homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.