Top 50 of 160 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 Dorchester: Reliance London Heating, Air Conditioning & Plumbing, 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 | Reliance London Heating, Air Conditioning & Plumbing | 66 | 4.8★ (12,217) | London, 10 km away | 24/7 |
| 2 | M & K Heating and Air Conditioning | 63 | 4.6★ (1,614) | London, 13 km away | 24/7 |
| 3 | Roy Inch & Sons Home Services by Enercare | 62 | 4.7★ (1,490) | London, 16 km away | 24/7 |
| 4 | Handy Bros. HVAC London (AC and Furnace Repair) | 62 | 4.9★ (536) | London, 13 km away | 24/7 |
| 5 | Orzech Heating and Cooling | 61 | 4.8★ (272) | London, 12 km away | 24/7 |
| 6 | Abode Home Comfort | 61 | 5.0★ (499) | St. Thomas, 23 km away | 24/7 |
| 7 | Salliss Plumbing & Heating | 61 | 4.8★ (271) | London, 14 km away | 24/7 |
| 8 | Enns Air - HVAC Services | 61 | 5.0★ (110) | Huron East, 10 km away | 24/7 |
| 9 | Gastech Solutions Inc. | 61 | 4.9★ (491) | St. Thomas, 23 km away | 24/7 |
| 10 | Hawana HVAC Solutions Same Day Furnace & Installation | 61 | 5.0★ (130) | London, 12 km 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.
#1Reliance London Heating, Air Conditioning & Plumbing
Open 24/7 · 4.8 from 12,217 Google reviews
#2M & K Heating and Air Conditioning
Open 24/7 · 4.6 from 1,614 Google reviews
#3Roy Inch & Sons Home Services by Enercare
Open 24/7 · 4.7 from 1,490 Google reviews
#4Handy Bros. HVAC London (AC and Furnace Repair)
Open 24/7 · 4.9 from 536 Google reviews
Open 24/7 · 4.8 from 272 Google reviews
Open 24/7 · 5.0 from 499 Google reviews
Open 24/7 · 4.8 from 271 Google reviews
Open 24/7 · 5.0 from 110 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 160 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 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.
Based in London, 13 km away
Ranked #2 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 #3 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 #4 because of its Google rating and trade focus: 4.9★ from 536 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 12 km away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 272 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, 14 km away
Ranked #7 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.
Based in Huron East, 10 km away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 110 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Thomas, 23 km away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 491 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, 8 km away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 55 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 15 km away
Ranked #12 because of its Google rating and trade focus: 4.6★ from 250 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Thomas, 25 km away
Ranked #13 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 #14 because of its Google rating and trade focus: 4.9★ from 203 Google reviews, listed on Google as “Air conditioning contractor”.
Based in London, 11 km away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 14 km away
Ranked #16 because of its Google rating and trade focus: 4.4★ from 177 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 15 km away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 71 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 7 km away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 23 Google reviews, listed on Google as “HVAC contractor”.
Based in Ingersoll, 17 km away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 53 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 17 km away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 49 Google reviews, listed on Google as “HVAC contractor”.
Based in Norfolk County, 29 km away
Ranked #21 because of its Google rating and trade focus: 4.8★ from 236 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 7 km away
Ranked #22 because of its Google rating and trade focus: 4.5★ from 22 Google reviews, listed on Google as “HVAC contractor”.
Based in Lambton Shores, 6 km away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 14 Google reviews, listed on Google as “HVAC contractor”.
Based in London, 16 km away
Ranked #24 because of its Google rating and trade focus: 4.6★ from 73 Google reviews, listed on Google as “Air conditioning contractor”.
Based in London, 15 km away
Ranked #25 because of its Google rating and trade focus: 4.5★ from 55 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 |