409 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Saint Charles: Academy Air Heating, Cooling, Plumbing and Electric, CR Score 66/100; 4.8★ from 6,727 Google reviews; open 24/7.
Best for emergencies (open 24/7): B & B Heating & Cooling, posts 24/7 hours; ranked #2 of 409.
Most-reviewed: Hoffmann Brothers, 10,949 Google reviews at 4.9★, the most of 409 ranked; ranked #11.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
409 Saint Charles HVAC contractors are ranked here by CR Score, from ten published factors. 135 are open 24/7, 269 open Saturdays and 227 open Sundays, based on posted hours. The median Google rating is 4.9★ across 409 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Academy Air Heating, Cooling, Plumbing and Electric | 66 | 4.8★ (6,727) | Hazelwood, 4 mi away | 24/7 | Overall |
| 2 | B & B Heating & Cooling | 66 | 5.0★ (1,348) | Saint Charles | 24/7 | Emergencies |
| 3 | Hoffmann Brothers | 66 | 4.9★ (5,847) | St. Louis, 7 mi away | 24/7 | — |
| 4 | Jerry Kelly Heating & Air Conditioning | 66 | 4.9★ (6,530) | Saint Peters, 8 mi away | 24/7 | — |
| 5 | Classic Aire Care | 65 | 4.9★ (4,820) | St. Louis, 8 mi away | 24/7 | — |
| 6 | Air Comfort Service, Inc. | 65 | 4.9★ (2,041) | Hazelwood, 5 mi away | 24/7 | — |
| 7 | Air Comfort Service Inc. | 64 | 5.0★ (1,159) | Saint Peters, 6 mi away | 24/7 | — |
| 8 | Chesterfield Service | 64 | 4.9★ (4,286) | Chesterfield, 11 mi away | 24/7 | — |
| 9 | Integrity Aire | 64 | 5.0★ (288) | Saint Charles | 24/7 | — |
| 10 | Premier, Inc | 64 | 4.9★ (422) | Saint Charles | 24/7 | — |
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.
Ranked #1 in Saint Charles
Based in Hazelwood, 4 mi away
Ranked #1 because of its Google rating and trade focus: 4.8★ from 6,727 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Saint Charles
Ranked #2 because of its Google rating and trade focus: 5.0★ from 1,348 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Louis, 7 mi away
Ranked #3 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, 8 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 6,530 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Louis, 8 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 4,820 Google reviews, listed on Google as “HVAC contractor”.
Based in Hazelwood, 5 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 2,041 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 6 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 1,159 Google reviews, listed on Google as “HVAC contractor”.
Based in Chesterfield, 11 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 4,286 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles
Ranked #9 because of its Google rating and trade focus: 5.0★ from 288 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles
Ranked #10 because of its Google rating and trade focus: 4.9★ from 422 Google reviews, listed on Google as “HVAC contractor”.
Based in Brentwood, 13 mi away
Ranked #11 because of its Google rating and review volume: 4.9★ from 10,949 Google reviews, the most in Saint Charles.
Based in Maryland Heights, 6 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 2,541 Google reviews, listed on Google as “HVAC contractor”.
Based in Florissant, 9 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 1,285 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 1 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 275 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon, 12 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 1,068 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 8 mi away
Ranked #16 because of its Google rating and trade focus: 4.8★ from 1,113 Google reviews, listed on Google as “HVAC contractor”.
Based in Ballwin, 13 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 1,825 Google reviews, listed on Google as “Furnace repair service”.
Based in Ballwin, 13 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 1,014 Google reviews, listed on Google as “Heating contractor”.
Based in O'Fallon, 10 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 873 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles
Ranked #20 because of its Google rating and trade focus: 5.0★ from 101 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon, 12 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 696 Google reviews, listed on Google as “HVAC contractor”.
Based in O'Fallon, 12 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 924 Google reviews, listed on Google as “HVAC contractor”.
Based in Berkeley, 6 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 303 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 8 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 6,200 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Peters, 10 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 355 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. We publish the top 50 of 409 ranked HVAC contractors here; the rest are on their profiles.
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 |
|---|---|---|
| Advantage HVAC, Heating & Cooling | In Saint Charles | |
| Brentwood Heating, Cooling & Duct Cleaning | 5.0★ (2) | 10 mi |
| Central Air Heating and Cooling | 4.8★ (497) | 23 mi |
| Click Heating & Cooling | 5.0★ (28) | 8 mi |
| Coleman Heating and Sheet Metal | 5.0★ (2) | 2 mi |
| Dee Heating and Cooling | 5.0★ (2) | 16 mi |
| Expectancy Air Heating & Air Conditioning | 5.0★ (35) | 7 mi |
| Gene's Appliance AC & Heating | 4.9★ (207) | 19 mi |
| H & A Mechanical Services Inc | In Saint Charles | |
| Hazelwoods Heating and Air Conditioning | 5.0★ (2) | 11 mi |
| Hosack Plumbing, Heating & Cooling | 4.9★ (153) | 13 mi |
| Jaxon Heating & Cooling | 5.0★ (2) | 15 mi |
| KDYA Group USA LLC | In Saint Charles | |
| MRC Services LLC | 4.7★ (35) | 3 mi |
| Nation-Wide Refrigeration Inc | 5.0★ (2) | In Saint Charles |
| Optimal Heating and Cooling | 5.0★ (2) | 4 mi |
| Sears Heating and Air Conditioning | 2.0★ (2) | 7 mi |
| SMART St. Louis | 5.0★ (2) | 8 mi |
| Veterans HVAC | 5.0★ (2) | 13 mi |
| Welsch Heating & Cooling | 4.5★ (162) | 6 mi |
National price ranges in USD, not adjusted for Saint Charles. 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 |
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.
We scored 409 Saint Charles 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 Saint Charles 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 |