# HVAC contractors in Longmont

5 hvac contractors near Longmont, ranked by the strength of independent public evidence (reviews, verified credentials and registry data cross-checked across named sources — no ads, no paid placement). Below are the top 5 by evidence.

| Trader | Location | Rating | Reviews | Named sources |
| --- | --- | --- | --- | --- |
| [Groulx Mechanical Heating and Cooling inc](https://us.mytrustedtraders.com/traders/groulx-mechanical-heating-and-cooling-inc) | Longmont | 4.8/5 | 126 | Porch |
| [Viking Mechanical Services, LLC](https://us.mytrustedtraders.com/traders/viking-mechanical-services-llc) | Longmont | 4.9/5 | 27 | Porch |
| [SAC Mechanical](https://us.mytrustedtraders.com/traders/sac-mechanical) | Longmont | 4.4/5 | 16 | Porch |
| [BCIT Mechanical](https://us.mytrustedtraders.com/traders/bcit-mechanical) | Longmont | 3.9/5 | 30 | Porch |
| [Grafner Heating & Cooling](https://us.mytrustedtraders.com/traders/grafner-heating-cooling) | Longmont | 4.0/5 | 4 | Porch |

Each trader's full public-evidence record is at its profile URL (append `/md` for a Markdown version). See all hvac contractors in the United States at `https://us.mytrustedtraders.com/find/hvac-contractor`.

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Source: MyTrustedTraders — https://us.mytrustedtraders.com/find/hvac-contractor/longmont
Real public evidence only: every figure traces to a named source and is cross-checked. If a source does not carry a field, it is not shown.