Verified · Longmont
Trusted HVAC Companies in Longmont, CO
Trust matters when you're inviting a pro into your home or business. These hvac companies in Longmont have earned it through hundreds of verified reviews.
As of May 2026, RatingsNearMe ranks 16 hvac companies in Longmont, CO by verified customer ratings and review volume. The highest-rated is My Guy Heating and Air (Firestone) with a 4.9-star rating from 1,015 verified reviews. Also in the top tier: Blue Valley Heating & Cooling and Longview Heating & Air. The average rating across all listed hvac companies in Longmont is 4.8 stars from 232 reviews per business on average.
HVAC service in Longmont: $75–$150/hr for repairs; full system replacement $4,000–$12,000 depending on size and efficiency.
Rankings updated May 17, 2026 · Scored by ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · Not paid placement.
Local Market Snapshot
16
Businesses listed
4.8★
Avg rating
232
Avg reviews
May 17, 2026
Last updated
Top Rated HVAC Companies
My Guy Heating and Air (Firestone)
4321 Mulligan St, Longmont, CO 80504, USA
Blue Valley Heating & Cooling
1740 Skyway Dr UNIT H, Longmont, CO 80504, USA
Longview Heating & Air
3540 State Hwy 52 Suite H28, Frederick, CO 80516, USA
HVAC Companies Rankings in Longmont, CO
| # | Business | Rating | Reviews |
|---|---|---|---|
| #1 | My Guy Heating and Air (Firestone)4321 Mulligan St, Longmont, CO 80504, USA | 4.9★ | 1,015 |
| #2 | Blue Valley Heating & Cooling1740 Skyway Dr UNIT H, Longmont, CO 80504, USA | 4.8★ | 1,172 |
| #3 | Longview Heating & Air3540 State Hwy 52 Suite H28, Frederick, CO 80516, USA | 5.0★ | 334 |
| #4 | Colorado's Finest Heating and Air Conditioning1524 Collyer St, Longmont, CO 80501, USA | 4.9★ | 223 |
| #5 | Groulx Mechanical Heating & Cooling Inc.2447 Winding Dr, Longmont, CO 80504, USA | 5.0★ | 252 |
| #6 | Circulating Air Inc500 9th Ave #12, Longmont, CO 80501, USA | 4.8★ | 55 |
| #7 | Carroll Mechanical Services733 S Bowen St, Longmont, CO 80501, USA | 4.8★ | 77 |
| #8 | Highland Heating & Air, Inc.14286 Mead St, Longmont, CO 80504, USA | 4.7★ | 52 |
| #9 | KJ Thomas Mechanical6175 Trevarton Dr, Longmont, CO 80503, USA | 4.9★ | 250 |
| #10 | Homerun Heating & Air727 Main St, Longmont, CO 80501, USA | 4.7★ | 72 |
Ranked by verified ratings & review volume · Data from Google Business listings · Updated May 2026
All HVAC Companies in Longmont
Colorado's Finest Heating and Air Conditioning
1524 Collyer St, Longmont, CO 80501, USA
Groulx Mechanical Heating & Cooling Inc.
2447 Winding Dr, Longmont, CO 80504, USA
Circulating Air Inc
500 9th Ave #12, Longmont, CO 80501, USA
Carroll Mechanical Services
733 S Bowen St, Longmont, CO 80501, USA
Highland Heating & Air, Inc.
14286 Mead St, Longmont, CO 80504, USA
KJ Thomas Mechanical
6175 Trevarton Dr, Longmont, CO 80503, USA
Homerun Heating & Air
727 Main St, Longmont, CO 80501, USA
SAC Mechanical Heating & Air Conditioning
105 S Sunset St A, Longmont, CO 80501, USA
Trusted Longmont HVAC Services
1701 Main St, Longmont, CO 80501, USA
Stone Heating & Air
16792 Weld CoRd 1, Longmont, CO 80504, USA
ComfortFlow HVAC Repair
1738 Hover St, Longmont, CO 80503, USA
Stoney Heating and Air
11198 Cimarron St, Longmont, CO 80504, USA
Woelfel Heating & Air
601 S Bowen St, Longmont, CO 80501, USA
Get Free Quotes
We'll connect you with the top hvac companies in Longmont, CO.
Frequently Asked Questions — HVAC Companies in Longmont
How do I find the best hvac companies in Longmont?
Look for businesses with 4.5+ stars, 50+ verified reviews, proper licensing and insurance, and transparent pricing. The top-ranked hvac companies in Longmont on this page are scored by our algorithm that weighs ratings, review count, and profile completeness.
Are hvac companies in Longmont licensed and insured?
Licensing requirements vary by trade and state. For most home service contractors, CO requires both a state license and liability insurance. Always ask any contractor for proof of current insurance and a copy of their license number before work begins — you can verify most licenses on your state licensing board's website.
How much do hvac companies charge in Longmont, CO?
Prices vary by scope, materials, and contractor experience. Use the free quote form on this page to request estimates from multiple local pros simultaneously. Getting 3+ quotes is the single most effective way to avoid overpaying.
What should I look for when hiring a hvac companies in Longmont?
Verify licensing and insurance, read recent reviews on multiple platforms, ask for a written estimate before work starts, confirm they pull permits when required, and check references from recent local projects. Featured businesses on this page are ranked by verified ratings and review quality.
How are the hvac companies on this page ranked?
Rankings use a transparent algorithm: star rating (35%), review volume (30%), customer sentiment (20%), profile completeness (10%), and availability (5%). Featured Partner listings have paid for enhanced visibility but must still earn their position through real customer reviews — sponsored listings are clearly labeled.
HVAC Companies in Nearby Cities
Compare top-rated hvac companies in cities near you.
How Rankings Work on This Page
Every hvac companies on RatingsNearMe is scored transparently: star rating (35%), review volume (30%), customer sentiment (20%), profile completeness (10%), and availability (5%). Businesses labeled exclusive or premium are Featured Partners — they have paid for enhanced visibility but must still rank through real customer reviews. We cap sponsored boosts so bad businesses can never buy the top spot.
Editorial notice: Ratings are based on publicly available data from Google Business listings. Consumers should independently verify licensing, insurance, and credentials before hiring any service provider. Last updated: May 17, 2026.
More Home Services in Longmont
Related Searches
More ways to find hvac companies in Longmont
HVAC Companies in nearby cities