129 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in St. Thomas: Abode Home Comfort, CR Score 64/100; 5.0★ from 499 Google reviews; open 24/7.
Best for emergencies (open 24/7): Gastech Solutions Inc., posts 24/7 hours; ranked #2 of 129.
Most-reviewed: Reliance London Heating, Air Conditioning & Plumbing, 12,217 Google reviews at 4.8★, the most of 129 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
129 St. Thomas HVAC contractors are ranked here by CR Score, from ten published factors. 57 are open 24/7, 74 open Saturdays and 63 open Sundays, based on posted hours. The median Google rating is 4.8★ across 129 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Abode Home Comfort | 64 | 5.0★ (499) | St. Thomas | 24/7 | Overall |
| 2 | Gastech Solutions Inc. | 64 | 4.9★ (491) | St. Thomas | 24/7 | Emergencies |
| 3 | Handy Bros. HVAC St. Thomas (AC and Furnace Repair) | 63 | 4.9★ (313) | St. Thomas | 24/7 | — |
| 4 | Reliance London Heating, Air Conditioning & Plumbing | 63 | 4.8★ (12,217) | London, 29 km away | 24/7 | Most reviews |
| 5 | Roy Inch & Sons Home Services by Enercare | 61 | 4.7★ (1,490) | London, 18 km away | 24/7 | — |
| 6 | Handy Bros. HVAC London (AC and Furnace Repair) | 61 | 4.9★ (536) | London, 18 km away | 24/7 | — |
| 7 | KALJIC Mechanical | 61 | 5.0★ (55) | St. Thomas | 24/7 | — |
| 8 | Donaldson Heating and Air Conditioning | 60 | 4.9★ (2,733) | London, 18 km away | Sat · Evenings | — |
| 9 | M & K Heating and Air Conditioning | 60 | 4.6★ (1,614) | London, 23 km away | 24/7 | — |
| 10 | Hawana HVAC Solutions Same Day Furnace & Installation | 59 | 5.0★ (130) | London, 19 km away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 499 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #2 because of its Google rating and trade focus: 4.9★ from 491 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #3 because of its Google rating and trade focus: 4.9★ from 313 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 29 km away
Ranked #4 because of its Google rating and review volume: 4.8★ from 12,217 Google reviews, the most in St. Thomas.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #5 because of its Google rating and trade focus: 4.7★ from 1,490 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 536 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #7 because of its Google rating and trade focus: 5.0★ from 55 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 2,733 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 23 km away
Ranked #9 because of its Google rating and trade focus: 4.6★ from 1,614 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 19 km away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 130 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #11 because of its Google rating and trade focus: 4.9★ from 23 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 23 km away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 26 km away
Ranked #13 because of its Google rating and trade focus: 4.8★ from 860 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 26 km away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 493 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #16 because of its Google rating and trade focus: 5.0★ from 63 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
Ranked #17 because of its Google rating and trade focus: 4.8★ from 60 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in London, 24 km away
Ranked #18 because of its Google rating and trade focus: 4.6★ from 250 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 23 km away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 228 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Aylmer, 16 km away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 29 km away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 265 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #22 because of its Google rating and trade focus: 4.6★ from 73 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 19 km away
Ranked #23 because of its Google rating and trade focus: 4.4★ from 177 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Huron East, 35 km away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 110 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 20 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#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 129 ranked HVAC contractors here; the rest are on their profiles.
20 more HVAC contractors within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| 1Click Heating and Cooling London Ontario | 5.0★ (1) | 19 km |
| A.J. Smith Heating & Cooling | 5.0★ (1) | 27 km |
| All Care Energy | 3.0★ (2) | 39 km |
| Blake Mechanical Svc Inc | 5.0★ (2) | 25 km |
| C.J. HVAC Services | 5.0★ (2) | 20 km |
| Geerlinks Home Hardware Building Centre | 4.4★ (916) | In St. Thomas |
| Getec Home Comfort | 5.0★ (6) | 28 km |
| House Mechanical Inc | In St. Thomas | |
| Hvac London | 5.0★ (2) | 20 km |
| London Home Comfort | 4.7★ (13) | 25 km |
| M & R Mechanical Heating & Cooling | 5.0★ (4) | 27 km |
| MBH Mechanical | 5.0★ (1) | 37 km |
| Mozee Gas Heating & Cooling | 5.0★ (11) | 26 km |
| Pro Desk at RONA | In St. Thomas | |
| R & R Refrigeration | 5.0★ (2) | 35 km |
| Randy Laur Burner Service | 4.1★ (9) | 17 km |
| Roto-Static Carpet & Upholstery and Duct Cleaning | 4.9★ (43) | In St. Thomas |
| Steve Young Plumbing & Heating Ltd | 4.8★ (83) | 26 km |
| Superior Plumbing & Heating of Aylmer | 4.8★ (22) | 15 km |
| Toasty's Heat and Cool | 5.0★ (19) | 40 km |
US national ranges converted to CAD, not adjusted for St. Thomas. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | CA$5,460 | CA$8,400 | CA$11,350 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
| Furnace replacement | CA$3,970 | CA$6,770 | CA$9,690 | Per system, installed; typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
In Ontario, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.
We scored 129 St. Thomas 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 St. Thomas 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 |