66/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 10,949 Google reviews, the most in Clayton.
- 4.9★ from 10,949 Google reviews
- Hours
- Mon–Sun 6 AM–9 PM
- Address
- 1025 Hanley Industrial Ct, Brentwood, MO 63144
Best HVAC Contractors in Clayton, MO (2026)
472 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Clayton: Hoffmann Brothers, CR Score 66/100; 4.9★ from 10,949 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Classic Aire Care, posts 24/7 hours; ranked #2 of 472.
- 6
Most-reviewed: Morrison Plumbing, Heating, Air, & Electrical Services, 8,631 Google reviews at 4.9★, the most of 472 ranked after Hoffmann Brothers; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
472 Clayton HVAC contractors are ranked here by CR Score, from ten published factors. 163 are open 24/7, 307 open Saturdays and 258 open Sundays, based on posted hours. The median Google rating is 4.9★ across 472 rated businesses.
Top 10 HVAC contractors in Clayton at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Hoffmann Brothers | 66 | 4.9★ (10,949) | Brentwood, 2 mi away | Sat · Sun · Evenings | Overall |
| 2 | Classic Aire Care | 66 | 4.9★ (4,820) | St. Louis, 5 mi away | 24/7 | Emergencies |
| 3 | Hoffmann Brothers | 66 | 4.9★ (5,847) | St. Louis, 7 mi away | 24/7 | — |
| 4 | Academy Air Heating, Cooling, Plumbing and Electric | 64 | 4.8★ (6,727) | Hazelwood, 11 mi away | 24/7 | — |
| 5 | Rhymes Heating and Cooling | 64 | 5.0★ (1,430) | St. Louis, 8 mi away | 24/7 | — |
| 6 | Morrison Plumbing, Heating, Air, & Electrical Services | 64 | 4.9★ (8,631) | Collinsville, 16 mi away | 24/7 | Most reviews |
| 7 | Dole Heating & Air Conditioning | 64 | 4.9★ (1,401) | St. Louis, 7 mi away | 24/7 | — |
| 8 | Air Comfort Service, Inc. | 64 | 4.9★ (2,041) | Hazelwood, 9 mi away | 24/7 | — |
| 9 | SmartHouse Heating and Cooling | 64 | 4.9★ (476) | St. Louis, 2 mi away | 24/7 | — |
| 10 | Scott-Lee Company | 63 | 4.9★ (2,175) | St. Louis, 10 mi away | 24/7 | — |
The 472 best HVAC contractors in Clayton, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in St. Louis, 5 mi away
66/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 4,820 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 4,820 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1276 N Warson Rd, St. Louis, MO 63132
Based in St. Louis, 7 mi away
66/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 5,847 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 5,847 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2043 Woodland Pkwy #100, St. Louis, MO 63146
Based in Hazelwood, 11 mi away
64/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 6,727 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.8★ from 6,727 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4848 Park 370 Blvd Suite F, Hazelwood, MO 63042
Based in St. Louis, 8 mi away
64/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 1,430 Google reviews, listed on Google as “Heating contractor”.
- 5.0★ from 1,430 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10958 Lin Valle Dr, St. Louis, MO 63123
Based in Collinsville, 16 mi away
64/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 8,631 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 8,631 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1607 Eastport Plaza Dr Ste 119, Collinsville, IL 62234
Based in St. Louis, 7 mi away
64/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 1,401 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,401 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1920 S Broadway, St. Louis, MO 63104
Based in Hazelwood, 9 mi away
64/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 2,041 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,041 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 11920 Missouri Bottom Rd, Hazelwood, MO 63042
Based in St. Louis, 2 mi away
64/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 476 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 476 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6921 Olive Blvd, St. Louis, MO 63130
Based in St. Louis, 10 mi away
63/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 2,175 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,175 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 11010 Gravois Industrial Ct, St. Louis, MO 63128
Based in Saint Peters, 17 mi away
63/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 6,530 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 6,530 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4631 N St Peters Pkwy, St Peters, MO 63304
Based in St. Louis, 4 mi away
63/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.9★ from 487 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 487 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2704 Brannon Ave, St. Louis, MO 63139
Based in St. Louis, 4 mi away
63/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 5,170 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 5,170 Google reviews
- Hours
- Mon–Fri 7 AM–6 PM · Sat 7 AM–5 PM · Sun closed
- Address
- 1643 Tower Grove Ave, St. Louis, MO 63110
Based in Florissant, 10 mi away
63/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 1,285 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,285 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1955 Washington St, Florissant, MO 63033
Based in Ballwin, 11 mi away
63/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 1,825 Google reviews, listed on Google as “Furnace repair service”.
- 4.9★ from 1,825 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 14548 Manchester Rd, Ballwin, MO 63011
Based in Maryland Heights, 7 mi away
63/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 2,541 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,541 Google reviews
- Hours
- Mon–Sun 8 AM–9 PM
- Address
- 2550 Harley Dr, Maryland Heights, MO 63043
Based in Chesterfield, 16 mi away
63/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 4,286 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 4,286 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 245 Chesterfield Industrial Blvd, Chesterfield, MO 63005
Based in St. Louis, 5 mi away
63/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 494 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 494 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4719 Morgan Ford Rd, St. Louis, MO 63116
Based in St. Louis, 5 mi away
63/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 926 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 926 Google reviews
- Hours
- Mon–Sun 8 AM–9 PM
- Address
- 5804 Hampton Ave, St. Louis, MO 63109
Based in St. Louis, 2 mi away
63/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.7★ from 2,264 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 2,264 Google reviews
- Hours
- Mon–Fri 7 AM–7 PM · Sat–Sun 9 AM–4 PM
- Address
- 7584 Olive Blvd #207, St. Louis, MO 63130
Based in Arnold, 14 mi away
63/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 1,400 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,400 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2104 Tenbrook Rd, Arnold, MO 63010
Based in Saint Charles, 14 mi away
62/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 1,348 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,348 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2115 S Old Hwy 94, St Charles, MO 63303
Based in St. Louis, 2 mi away
62/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 163 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 163 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6544 Southwest Ave, St. Louis, MO 63139
Based in Ballwin, 13 mi away
62/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 1,014 Google reviews, listed on Google as “Heating contractor”.
- 5.0★ from 1,014 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 930 Kehrs Mill Rd suite 325-9, Ballwin, MO 63011
Based in Brentwood, 2 mi away
62/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 153 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 153 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2202 S Brentwood Blvd, Brentwood, MO 63144
HVAC contractors ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 472 ranked HVAC contractors here; the rest are on their profiles.
Also serving Clayton
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Advanced Heating Cooling and Refrigeration | 5.0★ (2) | 20 mi |
| Brentwood Heating, Cooling & Duct Cleaning | 5.0★ (2) | 15 mi |
| Central Air Heating and Cooling | 4.8★ (497) | 17 mi |
| Coleman Heating and Sheet Metal | 5.0★ (2) | 11 mi |
| Dee Heating and Cooling | 5.0★ (2) | 4 mi |
| Elite Heating & Cooling | 1.0★ (2) | 7 mi |
| Elm Heating & Air Conditioning | 5.0★ (2) | 15 mi |
| JBR Heating and Cooling | 5.0★ (20) | 4 mi |
| Midwest Radiant Heat Inc | 3.0★ (2) | 15 mi |
| Nation-Wide Refrigeration Inc | 5.0★ (2) | 14 mi |
| Optimal Heating and Cooling | 5.0★ (2) | 14 mi |
| Saint Peters Heating & Air Conditioning | 5.0★ (2) | 19 mi |
| Sears Heating and Air Conditioning | 2.0★ (2) | 8 mi |
| SMART St. Louis | 5.0★ (2) | 5 mi |
| Stellar Heating and Air Conditioning | 5.0★ (2) | 13 mi |
| Swiss, LLC | 4.9★ (924) | 23 mi |
| TC Heating and Cooling | 5.0★ (2) | 9 mi |
| The Furnace Guys Heating & Cooling LLC | 5.0★ (123) | 15 mi |
| Triple L | 3.5★ (2) | 13 mi |
| Welsch Heating & Cooling | 4.5★ (162) | 7 mi |
How much do HVAC contractors cost in Clayton?
National price ranges in USD, not adjusted for Clayton. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
When to hire an HVAC contractor in Missouri
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
How we ranked Clayton HVAC contractors
We scored 472 Clayton HVAC contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Clayton data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
HVAC contractors in Clayton: frequently asked questions
Who is the best HVAC contractor in Clayton?
By CR Score, the highest-ranked HVAC contractor in Clayton, MO is Hoffmann Brothers with a CR Score of 66/100. It has 4.9★ from 10,949 Google reviews. It is open 7 days a week. Classic Aire Care (#2) and Hoffmann Brothers (#3) follow. We ranked 472 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in Clayton?
ContractorsRanked ranks 472 HVAC contractors serving Clayton, MO. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Clayton are open 24/7?
163 ranked HVAC contractors in Clayton post 24/7 hours. The highest-ranked are Classic Aire Care (#2), Hoffmann Brothers (#3) and Academy Air Heating, Cooling, Plumbing and Electric (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Clayton work on weekends?
307 of 472 ranked HVAC contractors post Saturday hours and 258 post Sunday hours. The highest-ranked open Saturdays are Hoffmann Brothers (#1), Classic Aire Care (#2) and Hoffmann Brothers (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does ac replacement cost in Clayton?
AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Clayton. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Clayton HVAC contractors have?
The median Google rating among 472 rated HVAC contractors in Clayton is 4.9★, with a median of 23 reviews. Hoffmann Brothers has the most, 10,949 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in Clayton?
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
How does ContractorsRanked rank HVAC contractors?
Each HVAC contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Update log for Clayton
- October 2026: CR Scores recalculated for 472 hvac contractors serving Clayton.
- October 2026: 3 duplicate listings merged.
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