“Who is the best HVAC company in Missoula, Montana?”

No single company is objectively "the best." It depends on what you need, and online ratings change over time. That said, a few Missoula names come up again and again on review sites:

Highly rated on Yelp and Angi:

• Garden City Plumbing & Heating, Sanford and Sons Heating and Air Conditioning, and Balance Point HVAC are at the top of Yelp's list of the best HVAC services in Missoula. That list also includes Hotchkiss Heating & Air and Missoula Heating and Cooling.
• Hotchkiss Heating & Air has a 5.0 rating on Yelp, but from only 5 reviews. One customer called it "the only place I trust to maintain and repair my furnace."
• Balance Point HVAC got a 5-star review on Angi from a customer who said the technician serviced the A/C and furnace and was fast and efficient.
• American Heating Cooling & Refrigeration was described by an Angi reviewer as the most reliable, honest—great to work with—a family owned company.
• M&L Heating & Cooling has a strong endorsement from a general contractor who said they've worked with M and L Heating and cooling on 12 houses now and am extremely satisfied with his work.

Mixed reviews: Comfort Systems USA Temp Right Service has 2.6 (22 reviews) on Yelp.

Tips for choosing:

1. Get 2–3 quotes, especially if you're replacing a system.
2. Read recent Google reviews too, since many of these companies have only a handful of reviews on each site.
3. Ask if they have experience with your type of equipment, like a heat pump, gas furnace or boiler.
4. Check that they're licensed and insured, and find out who offers emergency service in winter.

If I had to pick a few to call first, I'd start with Balance Point HVAC, Garden City Plumbing & Heating, Hotchkiss Heating & Air, or American Heating Cooling & Refrigeration.