Top Picks · O'fallon
Best HVAC Companies in O'fallon, MO
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As of June 2026, RatingsNearMe ranks 12 hvac companies in O'fallon, MO by the RNM Score — a 0–100 rating built from Google ratings, review volume, sentiment, and profile completeness. The top-ranked is B & B Heating & Cooling with a 5.0-star rating from 1,400 Google reviews and an RNM Score of 88/100. Also in the top tier: Stay Cool Climate Control 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 9, 2026 · RNM Score = ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · Not paid placement.
O'Fallon, MO is home to a variety of HVAC companies that provide installation, repair, and maintenance services for residential and commercial properties. Consumers should look for licensed, insured, and experienced HVAC contractors when searching for local service providers.
- ✓Reputable HVAC companies in O'Fallon, MO include Stay Cool Climate Control, Elite Heating and Cooling, Comfort Experts, Inc, B & B Heating & Cooling, and Swiss Air Heating & Cooling
- ✓HVAC services in O'Fallon cover a range of needs, from new system installation to routine maintenance and emergency repairs
- ✓Consumers should research HVAC contractors' credentials, reviews, and warranties when selecting a local service provider
Best Overall
Renaud Brothers Heating & Cooling
Renaud Brothers Heating & Cooling stands out as the top-ranked HVAC provider in O'Fallon due to its exceptional reputation for reliable service and customer satisfaction.
Most Reviewed
Renaud Brothers Heating & Cooling
A high number of reviews indicates broad community trust and a proven track record of consistent service quality.
When choosing an HVAC provider in O'Fallon, consider both the number of reviews and the overall reputation to ensure reliable service. Always request a written estimate and confirm licensing and insurance before hiring.
How to Choose a HVAC Companie in O'fallon
What to look for
- • Licensed and insured HVAC contractors
- • Technicians with NATE (North American Technician Excellence) certification
- • Companies that provide upfront pricing and written estimates
- • Contractors with experience working on the specific HVAC system in your home
Questions to ask
- • How long have you been in business in the O'Fallon, MO area?
- • Can you provide references from recent customers in O'Fallon?
- • What type of warranty or guarantee do you offer on your work?
Red flags
- ⚠ Contractors who do not have a physical business address in O'Fallon, MO
- ⚠ Companies that require full payment upfront before the work is completed
- ⚠ Technicians who do not seem knowledgeable about the latest HVAC technologies and energy-efficient systems
In Missouri, HVAC contractors must be licensed by the state. Be sure to verify that the contractor you hire is licensed and carries the appropriate insurance coverage.
Local Market Snapshot
12
Businesses listed
5★
Avg rating
709
Avg reviews
Jun 9, 2026
Last updated
Top Rated HVAC Companies
O'Fallon's top-rated HVAC company, with a perfect 5.0★ score from over 1,400 reviews.
2115 S Old Hwy 94, St Charles, MO 63303, USAO'Fallon's top-rated HVAC provider, boasting a perfect 5.0★ from over 1,100 reviews.
407 Sonderen St, O'Fallon, MO 63366, USAO'Fallon's top-rated HVAC company, with a perfect 5.0-star average from over 800 reviews.
103 Church St #20, O'Fallon, MO 63366, USAHVAC Companies Rankings in O'fallon, MO
| # | Business | Rating | Reviews |
|---|---|---|---|
| #1 | B & B Heating & Cooling2115 S Old Hwy 94, St Charles, MO 63303, USA | 5.0★ | 1,400 |
| #2 | Stay Cool Climate Control407 Sonderen St, O'Fallon, MO 63366, USA | 5.0★ | 1,114 |
| #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 | Renaud Brothers Heating & Cooling3037 Hopewell Rd, Wentzville, MO 63385, USA | 5.0★ | 632 |
| #7 | Comfort Experts, Inc5501 St Charles St St 101, Cottleville, MO 63304, USA | 5.0★ | 382 |
| #8 | Elite Heating and Cooling108 Hamilton Industrial Ct, Wentzville, MO 63385, USA | 5.0★ | 520 |
| #9 | No Problem Heating and Cooling1565 Kisker Rd, St Peters, MO 63304, USA | 4.8★ | 1,154 |
| #10 | Hoock's Heating & Cooling4 Mulberry St, Foristell, MO 63348, USA | 5.0★ | 815 |
Ranked by verified ratings & review volume · Data from Google Business listings · Updated June 2026
All HVAC Companies in O'fallon
113 Triad Center W, O'Fallon, MO 63366, USA
674 Whispering Willow Dr, O'Fallon, MO 63366, USA
3037 Hopewell Rd, Wentzville, MO 63385, USA
5501 St Charles St St 101, Cottleville, MO 63304, USA
108 Hamilton Industrial Ct, Wentzville, MO 63385, USA
Top-rated HVAC service in O'Fallon, MO with 4.8 stars from over 1,100 reviews.
1565 Kisker Rd, St Peters, MO 63304, USA
O'Fallon's top-rated HVAC provider boasts a flawless 5.0-star rating from over 800 reviews.
4 Mulberry St, Foristell, MO 63348, USA
13756 Shoreline Dr, Earth City, MO 63045, USA
O'Fallon's top-rated HVAC choice, with a stellar 4.9-star average from 931 reviews.
406 E Wabash St, O'Fallon, MO 63366, USA
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HVAC Companies in O'fallon, MO — Compared
| # | Business | RNM Score | Rating | Reviews |
|---|---|---|---|---|
| 1 | B & B Heating & Cooling | 88/100 | 5.0 ★ | 1,400 |
| 2 | Stay Cool Climate Control | 88/100 | 5.0 ★ | 1,114 |
| 3 | Design Aire Heating and Cooling | 88/100 | 5.0 ★ | 833 |
| 4 | One Hour Heating & Air Conditioning of O'Fallon | 80/100 | 5.0 ★ | 49 |
| 5 | KirbnJays Heating & Cooling | 87/100 | 4.9 ★ | 356 |
| 6 | Renaud Brothers Heating & Cooling | 88/100 | 5.0 ★ | 632 |
| 7 | Comfort Experts, Inc | 88/100 | 5.0 ★ | 382 |
| 8 | Elite Heating and Cooling | 88/100 | 5.0 ★ | 520 |
| 9 | No Problem Heating and Cooling | 85/100 | 4.8 ★ | 1,154 |
| 10 | Hoock's Heating & Cooling | 88/100 | 5.0 ★ | 815 |
Ranked by RatingsNearMe Score · ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · June 2026
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 9, 2026.
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