10+ Years · O'fallon
Experienced HVAC Companies in O'fallon, MO
Experience matters. These hvac companies in O'fallon have years of proven work behind them — and the reviews to back it up.
As of June 2026, RatingsNearMe ranks 12 hvac companies in O'fallon, MO by verified customer ratings and review volume. The highest-rated is Stay Cool Climate Control with a 5.0-star rating from 1,114 verified reviews. Also in the top tier: B & B Heating & Cooling and Design Aire Heating and Cooling. The average rating across all listed hvac companies in O'fallon is 5 stars from 709 reviews per business on average.
HVAC service in O'fallon: $75–$150/hr for repairs; full system replacement $4,000–$12,000 depending on size and efficiency.
Rankings updated June 1, 2026 · Scored by ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · Not paid placement.
Local Market Snapshot
12
Businesses listed
5★
Avg rating
709
Avg reviews
Jun 1, 2026
Last updated
Top Rated HVAC Companies
Stay Cool Climate Control
407 Sonderen St, O'Fallon, MO 63366, USA
B & B Heating & Cooling
2115 S Old Hwy 94, St Charles, MO 63303, USA
Design Aire Heating and Cooling
103 Church St #20, O'Fallon, MO 63366, USA
HVAC Companies Rankings in O'fallon, MO
| # | Business | Rating | Reviews |
|---|---|---|---|
| #1 | Stay Cool Climate Control407 Sonderen St, O'Fallon, MO 63366, USA | 5.0★ | 1,114 |
| #2 | B & B Heating & Cooling2115 S Old Hwy 94, St Charles, MO 63303, USA | 5.0★ | 1,400 |
| #3 | Design Aire Heating and Cooling103 Church St #20, O'Fallon, MO 63366, USA | 5.0★ | 833 |
| #4 | One Hour Heating & Air Conditioning of O'Fallon113 Triad Center W, O'Fallon, MO 63366, USA | 5.0★ | 49 |
| #5 | KirbnJays Heating & Cooling674 Whispering Willow Dr, O'Fallon, MO 63366, USA | 4.9★ | 356 |
| #6 | No Problem Heating and Cooling1565 Kisker Rd, St Peters, MO 63304, USA | 4.8★ | 1,154 |
| #7 | Renaud Brothers Heating & Cooling3037 Hopewell Rd, Wentzville, MO 63385, USA | 5.0★ | 632 |
| #8 | Hoock's Heating & Cooling4 Mulberry St, Foristell, MO 63348, USA | 5.0★ | 815 |
| #9 | Comfort Experts, Inc5501 St Charles St St 101, Cottleville, MO 63304, USA | 5.0★ | 382 |
| #10 | Elite Heating and Cooling108 Hamilton Industrial Ct, Wentzville, MO 63385, USA | 5.0★ | 520 |
Ranked by verified ratings & review volume · Data from Google Business listings · Updated June 2026
All HVAC Companies in O'fallon
One Hour Heating & Air Conditioning of O'Fallon
113 Triad Center W, O'Fallon, MO 63366, USA
KirbnJays Heating & Cooling
674 Whispering Willow Dr, O'Fallon, MO 63366, USA
No Problem Heating and Cooling
1565 Kisker Rd, St Peters, MO 63304, USA
Renaud Brothers Heating & Cooling
3037 Hopewell Rd, Wentzville, MO 63385, USA
Hoock's Heating & Cooling
4 Mulberry St, Foristell, MO 63348, USA
Comfort Experts, Inc
5501 St Charles St St 101, Cottleville, MO 63304, USA
Elite Heating and Cooling
108 Hamilton Industrial Ct, Wentzville, MO 63385, USA
Missouri Furnace & Air Conditioning
13756 Shoreline Dr, Earth City, MO 63045, USA
Swiss Air Heating & Cooling
406 E Wabash St, O'Fallon, MO 63366, USA
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Frequently Asked Questions — HVAC Companies in O'fallon
How do I find the best hvac companies in O'fallon?
Look for businesses with 4.5+ stars, 50+ verified reviews, proper licensing and insurance, and transparent pricing. The top-ranked hvac companies in O'fallon on this page are scored by our algorithm that weighs ratings, review count, and profile completeness.
Are hvac companies in O'fallon licensed and insured?
Licensing requirements vary by trade and state. For most home service contractors, MO 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 O'fallon, MO?
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 O'fallon?
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.
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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: June 1, 2026.
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