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TRUSTED BY LONGMONT, CO HOMEOWNERS

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

Verified Reviews for Heating And Air Conditioning Service pros in Longmont, CO

*The Angi rating for Heating And Air Conditioning Service companies in Longmont, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Longmont, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

Last update on July 16, 2026

Find Heating and air conditioning pros in Longmont

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
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Avatar for Absolute 1st Choice Heating & Air Conditioning Inc.
Absolute 1st Choice Heating & Air Conditioning Inc.
4.5(
122
)
Central A/C - Service or RepairCentral Air Cleaner - Repair or ServiceElectric Boiler or Radiator Heating System - Repair+10 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"Very satisfied. He worked through each step it took to install my Google Nest thermostat, insuring all was working well before he left."
Response time8 hrs
4 neighbors recently requested a quote
Recommended by97%of homeowners
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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%
81 neighbors recently requested a quote
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Avatar for 1st Action Plumbing Heating and Air, Inc.
1st Action Plumbing Heating and Air, Inc.
4.6(
152
)
Ductless Mini-split Heating System - Install or ReplaceDuctless Mini-split A/C - Install or ReplaceElectric Furnace / Forced Air Heating System - Install+7 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2017

Free estimates

Small jobs welcome

"I hired 1st action for a tune-up of my HVAC system. Rob did a thorough job and was very professional. I'll hire them if I need other work in the future without hesitation."
Navien Tankless
Lennox EL296V
Response time5 hrs
4 neighbors recently requested a quote
Recommended by91%of homeowners
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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
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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
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Avatar for HighPoint HVAC
HighPoint HVAC
5.0(
22
)
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
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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
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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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Avatar for D&D Air Duct Pros
D&D Air Duct Pros
5.0(
17
)
Air Ducts & Vents - Clean

Serving Longmont, CO and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Great service...showed up on time, all the right equipment & knowledge! Did fair pricing for extra dryer ducts. I highly recommend!"
Aftet
Save
After
Air Ducts
After

+35

2 neighbors recently requested a quote
Recommended by47%of homeowners
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Showing 1-10 of 617
Heating and Air Conditioning questions, answered by experts

If your whole house is cold that’s one thing, but what if you only have a few rooms that are cold? First, you need to determine why this may be happening. A good place to start is to investigate the potential causes listed in this article—heat transfer, airflow, thermostat problems, humidity, and insulation. Once you’ve narrowed down the issue, you’d apply the same principles to the cold rooms as you would to the entire home.

AC leaks are common, and an HVAC pro can usually fix them. You may be able to resolve some leaks on your own, but a professional HVAC technician should handle most AC leak repair. If left ignored, an AC leak could cause serious damage to your system or leave you with expensive water damage, usually leading to more costly repairs or replacements.

There are plenty of different not-so-great sounds to hear from your air conditioning unit, like squealing, grinding, water running, excessive gurgling, banging, and clanking. Each of these sounds can indicate a different malfunction with your unit, so it’s important to have a professional assess the problem before it gets worse.

The cost to install a ductless mini-split AC system ranges from $2,000 to $14,000, depending on the type of unit, the number of zones or rooms, and the complexity of the installation. On the low end, a system for one or two zones in a single room costs around $2,000. Covering two zones for more rooms can cost between $6,000 and $8,000. For a larger multi-zone system to cover an entire home, costs can be $14,000. If you don’t already have an AC system in place, you may need to add the cost of permits, an electrician, and a concrete pad.

A power outage can damage your air conditioner, just like a power surge can damage any electrical device or appliance. In most cases, your circuit breaker or built-in surge protection on your AC unit protects your AC and just needs a reset. But in other cases, it might be that your AC compressor or capacitor was blown during the power surge. You’ll need to have an HVAC professional repair or replace any AC parts. 

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.

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