Top Picks · Longmont
Best HVAC Companies in Longmont, CO
Rated and reviewed by real customers. Compare prices, read reviews, and call the top pros near you — for free.
As of July 2026, RatingsNearMe ranks 16 hvac companies in Longmont, CO by the RNM Score — a 0–100 rating built from Google ratings, review volume, sentiment, and profile completeness. The top-ranked is My Guy Heating and Air (Firestone) with a 4.9-star rating from 1,015 Google reviews and an RNM Score of 87/100. 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 July 4, 2026 · RNM Score = ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · Not paid placement.
Best Overall
Blue Valley Heating & Cooling
Blue Valley Heating & Cooling stands out as the top-ranked HVAC provider in Longmont due to its consistently high customer satisfaction and strong local reputation.
Most Reviewed
Blue Valley Heating & Cooling
A high review count indicates broad customer experience and trust, making it a reliable indicator of consistent service quality.
When choosing an HVAC provider in Longmont, consider both the number of reviews and the recency of feedback to ensure the company is actively serving the community. Always request a written estimate before work begins to avoid surprises.
Local Market Snapshot
16
Businesses listed
4.8★
Avg rating
232
Avg reviews
Jul 4, 2026
Last updated
Top Rated HVAC Companies
4.9 stars from over 1,000 reviews makes this Longmont HVAC provider highly trusted.
4321 Mulligan St, Longmont, CO 80504, USALongmont's top-rated HVAC provider, with 4.8 stars from over 1,100 reviews.
1740 Skyway Dr UNIT H, Longmont, CO 80504, USALongmont’s top-rated HVAC company with 5.0 stars from over 300 reviews.
3540 State Hwy 52 Suite H28, Frederick, CO 80516, USAHVAC 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 | Highland Heating & Air, Inc.14286 Mead St, Longmont, CO 80504, USA | 4.7★ | 52 |
| #5 | Carroll Mechanical Services733 S Bowen St, Longmont, CO 80501, USA | 4.8★ | 77 |
| #6 | Homerun Heating & Air727 Main St, Longmont, CO 80501, USA | 4.7★ | 72 |
| #7 | Groulx Mechanical Heating & Cooling Inc.2447 Winding Dr, Longmont, CO 80504, USA | 5.0★ | 252 |
| #8 | KJ Thomas Mechanical6175 Trevarton Dr, Longmont, CO 80503, USA | 4.9★ | 250 |
| #9 | Circulating Air Inc500 9th Ave #12, Longmont, CO 80501, USA | 4.8★ | 55 |
| #10 | SAC Mechanical Heating & Air Conditioning105 S Sunset St A, Longmont, CO 80501, USA | 4.6★ | 48 |
Ranked by verified ratings & review volume · Data from Google Business listings · Updated July 2026
All HVAC Companies in Longmont
Rated 4.7 stars from 52 reviews, this Longmont HVAC provider is highly trusted.
14286 Mead St, Longmont, CO 80504, USA
Rated 4.8 stars from 77 Google reviews, this Longmont HVAC company is highly trusted.
733 S Bowen St, Longmont, CO 80501, USA
Longmont HVAC with a strong 4.7-star rating from 72 Google reviews.
727 Main St, Longmont, CO 80501, USA
Trusted by hundreds of customers with a flawless 5.0-star Google rating.
2447 Winding Dr, Longmont, CO 80504, USA
Longmont's top-rated HVAC provider with 4.9 stars from 250 reviews.
6175 Trevarton Dr, Longmont, CO 80503, USA
Longmont HVAC trusted by dozens of customers, earning an exceptional 4.8-star rating.
500 9th Ave #12, Longmont, CO 80501, USA
Highly rated 4.6 stars from 48 reviews for HVAC service in Longmont.
105 S Sunset St A, Longmont, CO 80501, USA
5.0 stars from 6 Google reviews, reflecting exceptional customer satisfaction.
1701 Main St, Longmont, CO 80501, USA
4.9-star rating from nearly 50 Google reviews reflects exceptional local service.
16792 Weld CoRd 1, Longmont, CO 80504, USA
56 Google reviews give this Longmont HVAC company an exceptional 4.9-star rating.
1738 Hover St, Longmont, CO 80503, USA
Exceptional 5.0-star rating from 20 reviews in Longmont.
11198 Cimarron St, Longmont, CO 80504, USA
Solid 4.4-star rating from 35 reviews for reliable HVAC service in Longmont.
601 S Bowen St, Longmont, CO 80501, USA
Longmont HVAC with a near-perfect 4.9-star rating from over 200 reviews.
1524 Collyer St, Longmont, CO 80501, USA
Get Free Quotes
We'll connect you with the top hvac companies in Longmont, CO.
HVAC Companies in Longmont, CO — Compared
| # | Business | RNM Score | Rating | Reviews |
|---|---|---|---|---|
| 1 | My Guy Heating and Air (Firestone) | 87/100 | 4.9 ★ | 1,015 |
| 2 | Blue Valley Heating & Cooling | 85/100 | 4.8 ★ | 1,172 |
| 3 | Longview Heating & Air | 88/100 | 5.0 ★ | 334 |
| 4 | Highland Heating & Air, Inc. | 75/100 | 4.7 ★ | 52 |
| 5 | Carroll Mechanical Services | 79/100 | 4.8 ★ | 77 |
| 6 | Homerun Heating & Air | 77/100 | 4.7 ★ | 72 |
| 7 | Groulx Mechanical Heating & Cooling Inc. | 88/100 | 5.0 ★ | 252 |
| 8 | KJ Thomas Mechanical | 87/100 | 4.9 ★ | 250 |
| 9 | Circulating Air Inc | 77/100 | 4.8 ★ | 55 |
| 10 | SAC Mechanical Heating & Air Conditioning | 73/100 | 4.6 ★ | 48 |
Ranked by RatingsNearMe Score · ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · July 2026
Get your business on AI — ChatGPT, Perplexity & Google AI
AI assistants increasingly recommend local hvac companies straight from RatingsNearMe. Claim your spot in Longmont to get featured in AI answers, comparison tables, and “best near me” results — where customers are actually searching now.
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: July 4, 2026.
More Home Services in Longmont
Related Searches
More ways to find hvac companies in Longmont
HVAC Companies in nearby cities