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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

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

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

Serving Longmont, CO and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"Dale is professional a always gets the job done. He has replaced two HVAC systems in our home and we can always count on him to do great work!"
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

"Best HVAC team in town! Great communication, fair prices, and easy to work with and on time. Used them to fix a boiler issue before sub zero temps rolled in."
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
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Avatar for HighPoint HVAC
HighPoint HVAC
5.0(
24
)
Air Ducts & Vents - Clean

Serving Longmont, CO and surrounding areas

Approved

Credit card accepted

"had such a great experience with HighPoint HVAC! The entire process was seamless and incredibly easy from start to finish. I was able to schedule an appointment right away, and the team arrived exactly on time. They were professional, friendly, and took the time to explain everything clearly. After finishing the job, they left the space spotless; you’d never know any work had been done. Their quality of service and attention to detail really stood out, and the pricing was very fair. I’d highly recommend this company to anyone looking for reliable, high-quality HVAC service"
2 neighbors recently requested a quote
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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

"Alex was really nice and knowledgeable about our broken AC. We did pay the $89 service fee for the evaluation. What caught me off guard was the quote for a new Amana HVAC Unit - 26K! I mentioned that I need to get a few other estimates before committing. In response, Alex said that most people find out that his prices are competitive. I would have preferred that Alex said, "Great idea! That's a lot of money and it's always a good idea to get a 2nd opinion"...or something like that. After consulting 2 other family-owned businesses with stellar reviews, we were quoted prices that were 10 to 12 thousand less than One Hour. The equipment was the same, if not even higher efficiency. Definitely shop around before committing."
4 neighbors recently requested a quote
Recommended by92%of homeowners
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Avatar for 1st Action Plumbing Heating and Air, Inc.
1st Action Plumbing Heating and Air, Inc.
4.6(
153
)
Ductless Mini-split Heating System - Install or ReplaceElectric Furnace / Forced Air Heating System - InstallDuctless Mini-split A/C - Install or Replace+7 more

Serving Longmont, CO and surrounding areas

Approved

In business since 2017

Free estimates

Small jobs welcome

"Provided excellent advice regarding the installation of an electric water heater. Personable, knowledgeable, and professional. Have hired them to perform regular maintenance on HVAC and water heater."
Navien Tankless
Lennox EL296V
Response time5 hrs
7 neighbors recently requested a quote
Recommended by90%of homeowners
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Avatar for Heart Heating, Cooling, Plumbing & Electric
Heart Heating, Cooling, Plumbing & Electric
4.7(
92
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallHeat Pump - Install or Replace+17 more

Serving Longmont, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"Ben and Daniel from the Denver branch were excellent to work with. I highly recommend them for HVAC/HWH maintenance!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+24

11 neighbors recently requested a quote
Recommended by81%of homeowners
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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 AAA Service Plumbing, Heating & Electric - H
AAA Service Plumbing, Heating & Electric - H
4.4(
466
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Longmont, CO and surrounding areas

Approved

In business since 1983

Free estimates

Credit card accepted

"I had AAA out twice; once to clear clogged drains and again to service a toilet. Both technicians, Andre and John J, were highly knowledgeable, professional, on time, and extremely honest. Honesty goes a long way with me so I will gladly use AAA for all my plumbing & heating needs! I really appreciate getting a text message with the technicians photo prior to the appointment as well. Great company!"
My jobs
My jobs
My jobs
My jobs
Recommended by94%of homeowners
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Avatar for D&D Air Duct Pros
D&D Air Duct Pros
5.0(
18
)
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 by44%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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Heating and Air Conditioning FAQs, answered by experts

No, for two very important reasons. First, it’s illegal to release refrigerant into the air or ground since it can be toxic and cause environmental damage. Technicians typically pump old or extra refrigerant into separate tanks for special disposal. Second, without professional equipment to read refrigerant pressure and levels, plus the AC’s suggested requirements, it’s impossible to know if you’ve removed the right amount of refrigerant. Stay away from a DIY solution here and seek an expert with the right tools.

Ideally, an AC system should never need more Freon (a popular refrigerant) because it circulates in a closed loop. However, refrigerant leaks are not uncommon and may occur gradually over 5 to 15 years. If your system has a leak, it will need to be topped up in a process known as an AC recharge. Signs of a refrigerant leak include weakened AC performance, increased humidity in your home, higher utility bills, and a hissing sound from the unit. The cost of an AC recharge will depend on the size and type of your AC unit, as well as the type of refrigerant it uses.

You might notice that your air conditioner isn’t running as effectively as it once did. Specifically, your AC unit could take longer to cool your home, or it might struggle to remove humidity from the air. Higher utility bills and hissing sounds coming out of your AC could also indicate a leak.

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

Yes, a mini split AC system can replace central air—and quite easily, too. Since mini splits don’t require ductwork, homeowners can convert their central air system to a mini split to save money and energy. Consult with an HVAC professional to learn more about the process of replacing your central air with a mini split.

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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