Top 50 of 293 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank
25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.
#1 for emergency heating and cooling in O'Fallon: Jerry Kelly Heating & Air Conditioning, open 24/7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
| Rank | Business | CR Score | Google rating | Based in | Hours |
|---|---|---|---|---|---|
| 1 | Jerry Kelly Heating & Air Conditioning | 66 | 4.9★ (6,530) | Saint Peters, 7 mi away | 24/7 |
| 2 | Stay Cool Climate Control | 66 | 5.0★ (1,068) | O'Fallon | 24/7 |
| 3 | Hoock's Heating & Cooling | 65 | 5.0★ (768) | O'Fallon | 24/7 |
| 4 | Faszold Heating and Cooling | 65 | 4.9★ (873) | O'Fallon | 24/7 |
| 5 | Hosack Plumbing, Heating & Cooling | 65 | 5.0★ (696) | O'Fallon | 24/7 |
| 6 | Swiss, LLC | 65 | 4.9★ (924) | O'Fallon | 24/7 |
| 7 | Chesterfield Service | 64 | 4.9★ (4,286) | Chesterfield, 11 mi away | 24/7 |
| 8 | Air Comfort Service Inc. | 64 | 5.0★ (1,159) | Saint Peters, 7 mi away | 24/7 |
| 9 | KirbnJays Heating & Cooling | 64 | 4.9★ (340) | O'Fallon | 24/7 |
| 10 | B & B Heating & Cooling | 64 | 5.0★ (1,348) | Saint Charles, 10 mi away | 24/7 |
24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.
#1Jerry Kelly Heating & Air Conditioning
Open 24/7 · 4.9 from 6,530 Google reviews
Open 24/7 · 5.0 from 1,068 Google reviews
Open 24/7 · 5.0 from 768 Google reviews
Open 24/7 · 4.9 from 873 Google reviews
#5Hosack Plumbing, Heating & Cooling
Open 24/7 · 5.0 from 696 Google reviews
Open 24/7 · 4.9 from 924 Google reviews
Open 24/7 · 4.9 from 4,286 Google reviews
Open 24/7 · 5.0 from 1,159 Google reviews
24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 293 is on the HVAC contractors page.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 6,530 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #2 because of its Google rating and trade focus: 5.0★ from 1,068 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #3 because of its Google rating and trade focus: 5.0★ from 768 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #4 because of its Google rating and trade focus: 4.9★ from 873 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #5 because of its Google rating and trade focus: 5.0★ from 696 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #6 because of its Google rating and trade focus: 4.9★ from 924 Google reviews, listed on Google as “HVAC contractor”.
Based in Chesterfield, 11 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 4,286 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 7 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 1,159 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #9 because of its Google rating and trade focus: 4.9★ from 340 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles, 10 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 1,348 Google reviews, listed on Google as “HVAC contractor”.
Based in Hazelwood, 16 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 6,727 Google reviews, listed on Google as “Air conditioning contractor”.
Based in St. Louis, 16 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 5,847 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 6 mi away
Ranked #13 because of its Google rating and trade focus: 4.8★ from 1,113 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 5 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 355 Google reviews, listed on Google as “HVAC contractor”.
Based in Wentzville, 8 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 609 Google reviews, listed on Google as “Air conditioning contractor”.
Based in St. Louis, 19 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 4,820 Google reviews, listed on Google as “HVAC contractor”.
Based in Wentzville, 8 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 476 Google reviews, listed on Google as “HVAC contractor”.
Based in Wentzville, 8 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Hazelwood, 17 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 2,041 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon
Ranked #20 because of its Google rating and trade focus: 4.8★ from 112 Google reviews, listed on Google as “HVAC contractor”.
Based in Ballwin, 16 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 1,014 Google reviews, listed on Google as “Heating contractor”.
Based in Ballwin, 18 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 1,825 Google reviews, listed on Google as “Furnace repair service”.
Based in Saint Charles, 10 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 288 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 5 mi away
Ranked #24 because of its Google rating and trade focus: 4.7★ from 253 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 7 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 160 Google reviews, listed on Google as “HVAC contractor”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.
Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.
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 |
|---|---|---|
| Reputation | 15% | Google star rating, adjusted for how many reviews back it |
| Credentials | 15% | Active state license, bond and workers’ comp on file |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list |
| Recency | 5% | Share of reviews from the last 12 months |
| Availability | 15% | Weekly open hours, Saturday, Sunday, 24/7 or same-day |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) |
| Proximity | 5% | Based in the city scores highest, less the farther away it is |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are |