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Best HVAC companies in St. Charles, MO

The highest-scoring HVAC company in and near St. Charles is Integrity Aire (score 78, 5.0 stars from 393 Google reviews). 2 companies meet the 5 Star standard within 25 km.

Last updated Sep 25, 2026How we rank
  1. 1

    Integrity Aire

    5.0 · 393 Google reviewsSt Charles, MO
    InsuredBondedFree estimatesEmergency service
    78SCORE
    (314) 803-3664 WebsiteFull profile
  2. 2

    SmartHouse Heating and Cooling

    4.9 · 504 Google reviewsSt. Louis, MO
    Emergency serviceFinancing available
    75SCORE
    (314) 451-5391 WebsiteFull profile

We list only companies that clear our published bar, so this area is still filling in. As more HVAC companies near St. Charles qualify, they'll appear here automatically.

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HVAC companies in St. Charles: quick answers

Who is the highest-rated HVAC company in St. Charles, MO?

Integrity Aire has the highest 5 Star Score among HVAC companies in and near St. Charles: 78 out of 100, with a 5.0 star Google rating from 393 reviews.

How many 5 Star HVAC companies serve St. Charles?

2 HVAC companies meet our standard within 25 km of St. Charles: at least a 4.5 star rating, 20 or more reviews and a score of 60 or higher. The top 2 have 897 Google reviews between them, averaging 4.95 stars.

How are these HVAC companies ranked?

By 5 Star Score: rating quality adjusted for review count (45 points), review volume (25), review recency (15), years in business (10) and license verification (5). Businesses cannot pay to change their score.

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Ratings and review counts come from each company's public Google listing and are re-checked monthly. 5 Star Home Service Pros is independent; companies cannot pay for placement.