160 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Dorchester: Reliance London Heating, Air Conditioning & Plumbing, CR Score 66/100; 4.8★ from 12,217 Google reviews; open 24/7.
Best for emergencies (open 24/7): Handy Bros. HVAC London (AC and Furnace Repair), posts 24/7 hours; ranked #2 of 160.
Most-reviewed: Donaldson Heating and Air Conditioning, 2,733 Google reviews at 4.9★, the most of 160 ranked after Reliance London Heating, Air Conditioning & Plumbing; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
160 Dorchester HVAC contractors are ranked here by CR Score, from ten published factors. 64 are open 24/7, 84 open Saturdays and 71 open Sundays, based on posted hours. The median Google rating is 4.8★ across 160 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Reliance London Heating, Air Conditioning & Plumbing | 66 | 4.8★ (12,217) | London, 10 km away | 24/7 | Overall |
| 2 | Handy Bros. HVAC London (AC and Furnace Repair) | 62 | 4.9★ (536) | London, 13 km away | 24/7 | Emergencies |
| 3 | M & K Heating and Air Conditioning | 62 | 4.6★ (1,614) | London, 13 km away | 24/7 | — |
| 4 | Roy Inch & Sons Home Services by Enercare | 62 | 4.7★ (1,490) | London, 16 km away | 24/7 | — |
| 5 | Donaldson Heating and Air Conditioning | 61 | 4.9★ (2,733) | London, 13 km away | Sat · Evenings | Most reviews |
| 6 | Abode Home Comfort | 61 | 5.0★ (499) | St. Thomas, 23 km away | 24/7 | — |
| 7 | Peter Inch & Associates | 61 | 4.9★ (493) | London, 9 km away | Sat · Sun · Evenings | — |
| 8 | Finan Home Service | 61 | 4.8★ (860) | London, 11 km away | Sat · Sun · Evenings | — |
| 9 | Enns Air - HVAC Services | 61 | 5.0★ (110) | Huron East, 10 km away | 24/7 | — |
| 10 | Hawana HVAC Solutions Same Day Furnace & Installation | 61 | 5.0★ (130) | London, 12 km away | 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 Dorchester
Based in London, 10 km away
Ranked #1 because of its Google rating and review volume: 4.8★ from 12,217 Google reviews, the most in Dorchester.
Based in London, 13 km away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 536 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 13 km away
Ranked #3 because of its Google rating and trade focus: 4.6★ from 1,614 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 16 km away
Ranked #4 because of its Google rating and trade focus: 4.7★ from 1,490 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 13 km away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 2,733 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Thomas, 23 km away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 499 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 9 km away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 493 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 11 km away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 860 Google reviews, listed on Google as “HVAC contractor”.
Based in Huron East, 10 km away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 110 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 12 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 in St. Thomas, 23 km away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 491 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 14 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 in St. Thomas, 8 km away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 55 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Thomas, 25 km away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 313 Google reviews, listed on Google as “HVAC contractor”.
Based in Orangeville, 21 km away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 203 Google reviews, listed on Google as “Air conditioning contractor”.
Based in London, 14 km away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 228 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 11 km away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 15 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 in London, 15 km away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 71 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 21 km away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 265 Google reviews, listed on Google as “HVAC contractor”.
Based in Ingersoll, 17 km away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 53 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 7 km away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 23 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 17 km away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 49 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 14 km away
Ranked #24 because of its Google rating and trade focus: 4.4★ from 177 Google reviews, listed on Google as “HVAC contractor”.
Based in Norfolk County, 29 km away
Ranked #25 because of its Google rating and trade focus: 4.8★ from 236 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 160 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) | 18 km |
| A. Leroy Mechanical | 13 km | |
| A.J. Smith Heating & Cooling | 5.0★ (1) | 7 km |
| AJM Heating Air Conditioning & Gas Services Inc. | 4.8★ (36) | 28 km |
| All Care Energy | 3.0★ (2) | 17 km |
| Blake Mechanical Svc Inc | 5.0★ (2) | 13 km |
| C.J. HVAC Services | 5.0★ (2) | 15 km |
| Farrington Plumbing & Heating | 3.0★ (2) | 31 km |
| G.C. Lounsbury Heating & Air Conditioning | 4.9★ (34) | 29 km |
| HITECH ENERGY HVAC | 13 km | |
| Hvac London | 5.0★ (2) | 15 km |
| M & R Mechanical Heating & Cooling | 5.0★ (4) | 20 km |
| MBH Mechanical | 5.0★ (1) | 16 km |
| MDR Hvac , London Heating and Air Conditioning Services | 5.0★ (7) | 15 km |
| Metro Boiler Inc. | 5.0★ (1) | 33 km |
| My Heating and Cooling Guy | 5.0★ (2) | 35 km |
| Poulsen | 3.3★ (16) | 10 km |
| Superior Plumbing & Heating of Tillsonburg | 4.7★ (21) | 31 km |
| Tiger Temp | 5.0★ (6) | 15 km |
| Toasty's Heat and Cool | 5.0★ (19) | 33 km |
US national ranges converted to CAD, not adjusted for Dorchester. 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 160 Dorchester 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 Dorchester 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 |