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Longmont, CO

HVAC Contractors in Longmont, CO

38 HVAC contractors in Longmont, Colorado, with Google ratings, hours and websites where the business has them.

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38 HVAC contractors serving Longmont

Recommended businesses first, then businesses that have claimed their profile, then Verified ones, then by Google rating and review count. Use Sort to see highest rated first.

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  • HVAC Contractors

    M and M Heating & Cooling Plumbing & Electrical

    M and M Heating & Cooling, Plumbing & Electrical serves Dacono, Erie, Firestone, Frederick, Johnstown, and Longmont, Colorado with expert HVAC, plumbing, and electrical solutions. The company provides heating and AC repair, service, and installation; plumbing repair and maintenance; electrical work; and commercial HVAC services. Additional offerings include ductwork services, water heaters, and WiFi thermostats.

    HVAC repairHeating serviceAC installation

    Longmont, CO4.9(2871)Website

    Up to 3 businesses

  • HVAC Contractors

    Welzig Heating Air Plumbing & Electric

    Longmont, CO4.9(1167)Website

    Up to 3 businesses

  • HVAC Contractors

    Blue Valley Heating & Cooling

    Longmont, CO4.8(999)Website

    Up to 3 businesses

  • HVAC Contractors

    TNT Home Services - Longmont

    Longmont, CO4.8(865)Website

    Up to 3 businesses

  • HVAC Contractors

    Groulx Mechanical Heating & Cooling Inc.

    Longmont, CO4.9(245)Website

    Up to 3 businesses

  • HVAC Contractors

    KJ Thomas Mechanical

    Longmont, CO4.9(225)Website

    Up to 3 businesses

  • HVAC Contractors

    Colorado's Finest Heating and Air Conditioning

    Longmont, CO4.9(205)Website

    Up to 3 businesses

  • HVAC Contractors

    Your Comfort Heating & Cooling

    Longmont, CO4.9(76)Website

    Up to 3 businesses

  • HVAC Contractors

    Homerun Heating & Air

    Longmont, CO4.7(72)Website

    Up to 3 businesses

  • HVAC Contractors

    Carroll Mechanical Services

    Longmont, CO4.8(66)Website

    Up to 3 businesses
  • Circulating Air in Longmont, CO

    HVAC Contractors

    Circulating Air

    Circulating Air, established in 1994, provides heating and air conditioning installation, maintenance, and repair services throughout Northern Colorado. The company specializes in central air conditioning and heating systems, heat pumps, garage heaters, humidifiers, and electronic air filtration systems. Services include diagnostics, preventative maintenance, and emergency repairs. A no trip-charge policy and free second opinions are offered.

    AC installationHeating systemsHVAC repair

    Longmont, CO4.8(58)Closed nowWebsite

    Up to 3 businesses

  • HVAC Contractors

    Elemental Comfort Systems

    Longmont, CO4.9(55)Website

    Up to 3 businesses

  • HVAC Contractors

    Highland Heating & Air Inc.

    Longmont, CO4.7(52)Website

    Up to 3 businesses

  • HVAC Contractors

    ComfortFlow HVAC Repair

    Longmont, CO4.8(49)Website

    Up to 3 businesses

  • HVAC Contractors

    Longs Peak Heating & Cooling

    Longmont, CO5.0(47)Website

    Up to 3 businesses

  • HVAC Contractors

    SAC Mechanical Heating & Air Conditioning

    Longmont, CO4.6(45)Website

    Up to 3 businesses

  • HVAC Contractors

    Foundations Mechanical Services

    Longmont, CO5.0(41)Website

    Up to 3 businesses

  • HVAC Contractors

    Vertical Heating & Cooling LLC

    Longmont, CO4.6(37)Website

    Up to 3 businesses

  • HVAC Contractors

    Air Conditioning & Heating: HVAC Repair Longmont

    Longmont, CO3.7(27)Website

    Up to 3 businesses

  • HVAC Contractors

    Go-Forth and Fix It

    Longmont, CO5.0(13)

    Up to 3 businesses

  • HVAC Contractors

    Maddison Mechanical Inc

    Longmont, CO3.9(15)Website

    Up to 3 businesses

  • HVAC Contractors

    Dan’s Heating & Cooling

    Longmont, CO4.6(10)

    Up to 3 businesses

  • HVAC Contractors

    Tri County Heating & Cooling

    Longmont, CO4.1(9)Website

    Up to 3 businesses

  • HVAC Contractors

    Dni Heating Air Conditioning & Refrigeration

    Longmont, CO4.8(608)Website

    Up to 3 businesses

  • HVAC Contractors

    Control Service Center Inc

    Longmont, CO4.5(6)Website

    Up to 3 businesses

  • HVAC Contractors

    Sam's Heating & Air

    Longmont, CO5.0(4)Website

    Up to 3 businesses

  • HVAC Contractors

    Diller Mechanical Services LLC

    Longmont, CO3.0(4)Website

    Up to 3 businesses

  • HVAC Contractors

    Armendariz Heating and Cooling Inc.

    Longmont, COWebsite

    Up to 3 businesses

  • HVAC Contractors

    ATEK Heating & Air Conditioning Inc.

    Longmont, COWebsite

    Up to 3 businesses

  • HVAC Contractors

    Colorado Solar Heating & Air Conditioning

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Efficient Systems LLC

    Longmont, COWebsite

    Up to 3 businesses

  • HVAC Contractors

    Heating & Air Conditioning Company

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Honest Mechanical

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Innovations Mechanical

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Righty Tighty HVAC

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Scott's HVAC

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Texas Heat Colorado Cool

    Longmont, CO

    Up to 3 businesses

  • HVAC Contractors

    Viking Mechanical Services LLC

    Longmont, COWebsite

    Up to 3 businesses

38 of 38 shown. Recommended businesses first, then businesses that have claimed their profile, then Verified ones, then by Google rating and review count. Use Sort to see highest rated first.

Top rated

Highest-rated hvac contractors in Longmont

Ranked by Google rating, then review count. Only businesses rated 4.5 or higher with 5+ Google reviews qualify.

  1. Longs Peak Heating & Cooling

    5.047 Google reviewsVerified

  2. Foundations Mechanical Services

    5.041 Google reviewsVerified

  3. Go-Forth and Fix It

    5.013 Google reviewsVerified

  4. M and M Heating & Cooling Plumbing & Electrical

    4.92,871 Google reviewsVerified

    HVAC repair · Heating service · AC installation

  5. Welzig Heating Air Plumbing & Electric

    4.91,167 Google reviewsVerified

  6. Groulx Mechanical Heating & Cooling Inc.

    4.9245 Google reviewsVerified

See every hvac contractors in Longmont sorted by rating · Best of Longmont across every trade

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38 HVAC contractors serve Longmont, CO. 23 are rated 4.5 or higher on Google and 4 have a perfect 5.0. 29 have a website. Most common services: AC installation, HVAC repair, Air filtration, Electrical service, Heating service, Heating systems….

Verified on Google
23
Average rating
4.7 / 5
Google reviews
7,871

How Google categorizes hvac contractors in Longmont

Primary and secondary categories from each business’s Google Business Profile. Tap one to filter the list.

Services hvac contractors in Longmont list on Google

Service names as each business entered them on its Google Business Profile, with how many businesses list each one.

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All 53 services in Longmont

Page One Partner Research

How HVAC contractors in Longmont compare

HVAC ContractorsLongmontCOU.S.
Average Google rating (10+ reviews)4.734.714.69
Median Google reviews523625
Reviews for the top quarter215+127+108+
Have a website78.4%59.8%60.6%

Businesses listed in our directory, not every business in the market. Updated November 2026. HVAC Contractors industry report · What is a good rating for HVAC contractors? · Best cities for HVAC contractors

From Page One Partner Research

  • In Longmont, half of the HVAC contractors we list with reviews have 52 or fewer Google reviews, and 215+ puts one in the local top quarter; the average rating is 4.73 (37 listed in our directory). HVAC Contractors industry report
  • A good Google rating for HVAC contractors: in our directory, the median is 4.8 and at least a quarter hold a perfect 5.0. Half of them have 25 or fewer reviews. What is a good rating for HVAC contractors?
  • Colorado businesses in our directory average 4.57 stars on Google, ranking 7 of the 50 states we measured; 28.4% list no website. Ratings in every state

Quick answers

Who serves Longmont?

Names and Google ratings, straight from each business's profile.

Which HVAC contractors serve Longmont, CO?

38 HVAC contractors serve Longmont, CO. Highest rated (10+ reviews): Longs Peak Heating & Cooling (Verified, rated 5.0 on Google from 47 reviews), Foundations Mechanical Services (Verified, rated 5.0 on Google from 41 reviews) and Go-Forth and Fix It (Verified, rated 5.0 on Google from 13 reviews), plus 35 more.

How many HVAC contractors serve Longmont, CO, and how are they rated?

38 HVAC contractors serve Longmont, Colorado. 23 are rated 4.5 or higher on Google and 4 have a perfect 5.0. 29 have a website. Most common services: AC installation, HVAC repair, Air filtration, Electrical service, Heating service, Heating systems…. ZIP codes covered: 80501, 80504, 80503, 80502.

Which HVAC contractors in Longmont, CO have the most Google reviews?

M and M Heating & Cooling Plumbing & Electrical (2,871 reviews, rated 4.9), Welzig Heating Air Plumbing & Electric (1,167 reviews, rated 4.9) and Blue Valley Heating & Cooling (999 reviews, rated 4.8). Review counts are read from each business's Google Business Profile.

What kinds of HVAC contractors are in Longmont, CO?

Google lists them under Heating contractor (1) and HVAC contractor (1). A business can carry more than one category, so the counts overlap.

HVAC Contractors near Longmont

All of Colorado · Cities A–Z

FAQ

Questions about Longmont businesses

How businesses get here and how up to date everything is.

Yes. Page One Partner is a free directory of local service businesses across the United States. It costs nothing to search, and nothing for a business to be listed. Each profile is built from the business's public Google Business Profile, and an owner can claim, update or hide theirs at any time by contacting info@pageoneinsights.com.

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