68/100CR Score
Ranked #1 because of its Google rating and review volume: 4.8★ from 12,217 Google reviews, the most in London.
- 4.8★ from 12,217 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 16025 Robins Hill Rd, London, ON N5V 0C4
Best HVAC Contractors in London, ON (2026)
129 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in London: Reliance London Heating, Air Conditioning & Plumbing, CR Score 68/100; 4.8★ from 12,217 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Roy Inch & Sons Home Services by Enercare, posts 24/7 hours; ranked #2 of 129.
- 5
Most-reviewed: Donaldson Heating and Air Conditioning, 2,733 Google reviews at 4.9★, the most of 129 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
129 London HVAC contractors are ranked here by CR Score, from ten published factors. 55 are open 24/7, 75 open Saturdays and 65 open Sundays, based on posted hours. The median Google rating is 4.8★ across 129 rated businesses.
Top 10 HVAC contractors in London at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Reliance London Heating, Air Conditioning & Plumbing | 68 | 4.8★ (12,217) | London | 24/7 | Overall |
| 2 | Roy Inch & Sons Home Services by Enercare | 64 | 4.7★ (1,490) | London | 24/7 | Emergencies |
| 3 | Handy Bros. HVAC London (AC and Furnace Repair) | 64 | 4.9★ (536) | London | 24/7 | — |
| 4 | M & K Heating and Air Conditioning | 64 | 4.6★ (1,614) | London | 24/7 | — |
| 5 | Donaldson Heating and Air Conditioning | 63 | 4.9★ (2,733) | London | Sat · Evenings | Most reviews |
| 6 | Hawana HVAC Solutions Same Day Furnace & Installation | 62 | 5.0★ (130) | London | 24/7 | — |
| 7 | Salliss Plumbing & Heating | 62 | 4.8★ (271) | London | 24/7 | — |
| 8 | Finan Home Service | 62 | 4.8★ (860) | London | Sat · Sun · Evenings | — |
| 9 | Peter Inch & Associates | 62 | 4.9★ (493) | London | Sat · Sun · Evenings | — |
| 10 | Maxcare Heating And Cooling | 62 | 5.0★ (265) | London | Sat · Sun · Evenings | — |
The 129 best HVAC contractors in London, ranked
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.
Based in London
64/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 1,490 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 1,490 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3500 White Oak Rd Unit B-1, London, ON N6E 2Z9
Based in London
64/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 536 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 536 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 213 Consortium Ct, London, ON N6E 2S8
Based in London
64/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.6★ from 1,614 Google reviews, listed on Google as “HVAC contractor”.
- 4.6★ from 1,614 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 28 Adelaide St S, London, ON N5Z 3K2
Based in London
63/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 2,733 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,733 Google reviews
- Hours
- Mon–Sat 8 AM–11 PM · Sun closed
- Address
- 77 Bessemer Rd, London, ON N6E 1P9
Based in London
62/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 130 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 130 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 670 Millbank Dr, London, ON N6E 1S2
Based in London
62/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 271 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 443 South St, London, ON N6B 1C1
Based in London
62/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ from 860 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 860 Google reviews
- Hours
- Mon–Fri 7:30 AM–9 PM · Sat 9 AM–6 PM · Sun 10 AM–5 PM
- Address
- 461 Second St, London, ON N5V 2B1
Based in London
62/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 493 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 493 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 10 Pacific Ct Unit 2, London, ON N5V 3K4
Based in London
62/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 265 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 265 Google reviews
- Hours
- Mon–Thu 8 AM–10 PM · Fri 9 AM–10 PM · Sat 9 AM–8 PM · Sun 9 AM–5 PM
- Address
- 1994 Clayridge Wy, London, ON N6G 0V2
Based in London
61/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.6★ from 250 Google reviews, listed on Google as “HVAC contractor”.
- 4.6★ from 250 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 353 Clarence St Unit 11, London, ON N6A 3M4
Based in London
61/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.9★ from 228 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 228 Google reviews
- Hours
- Mon–Sun 8 AM–11 PM
- Address
- 492 Hill St, London, ON N6B 1E7
Based in London
61/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 71 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 71 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1291 Rideau Gate, London, ON N5X 1W8
Based in St. Thomas, 23 km away
61/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 499 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 499 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 107 Gaylord Rd, St Thomas, ON N5P 3S3
Based in London
61/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 62 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 39 Enterprise Dr, London, ON N6N 1A3
Based in London
61/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 49 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 49 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1853 Blackwater Rd #23, London, ON N5X 4R9
Based in London
61/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 121 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 121 Google reviews
- Hours
- Mon–Fri 8 AM–11 PM · Sat 8 AM–8 PM · Sun 8 AM–9 PM
- Address
- 2881 Heardcreek Trail, London, ON N6G 0V9
Based in St. Thomas, 22 km away
60/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 491 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 491 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45 Progress Dr, St Thomas, ON N5P 4G4
#19 Aire One
Based in London
60/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.4★ from 177 Google reviews, listed on Google as “HVAC contractor”.
- 4.4★ from 177 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 878 Wellington Rd, London, ON N6E 1L9
Based in London
60/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.6★ from 73 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.6★ from 73 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 309 Exeter Rd Building #45, London, ON N6E 0A3
Based in London
60/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 28 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in St. Thomas, 23 km away
60/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.9★ from 313 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 313 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 656 Talbot St Upper Level, St Thomas, ON N5P 1C8
Based in London
60/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 311 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 311 Google reviews
- Hours
- Mon–Fri 7:30 AM–6 PM · Sat 9 AM–3 PM · Sun closed
- Address
- 1680 Wharncliffe Rd S, London, ON N6L 0E3
Based in London
59/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.6★ from 40 Google reviews, listed on Google as “HVAC contractor”.
- 4.6★ from 40 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 662 Lauderdale Ave, London, ON N5X 1M7
Based in London
59/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.5★ from 55 Google reviews, listed on Google as “HVAC contractor”.
- 4.5★ from 55 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
HVAC contractors ranked #26 to #50
#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.
Also serving London
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) | In London |
| A. Leroy Mechanical | In London | |
| A.J. Smith Heating & Cooling | 5.0★ (1) | In London |
| AirWise Heating & Cooling | 5.0★ (29) | 30 km |
| AJM Heating Air Conditioning & Gas Services Inc. | 4.8★ (36) | 28 km |
| All Care Energy | 3.0★ (2) | 30 km |
| Blake Mechanical Svc Inc | 5.0★ (2) | In London |
| C.J. HVAC Services | 5.0★ (2) | In London |
| Desna Heating & Cooling | 5.0★ (4) | In London |
| Hurn Plumbing and Heating | 4.9★ (23) | 23 km |
| Hvac London | 5.0★ (2) | In London |
| M & R Mechanical Heating & Cooling | 5.0★ (4) | In London |
| MBH Mechanical | 5.0★ (1) | 29 km |
| My Heating and Cooling Guy | 5.0★ (2) | 29 km |
| Poulsen | 3.3★ (16) | In London |
| Premier Gas Services | 5.0★ (53) | 30 km |
| Renown Contractors | 4.6★ (20) | In London |
| Steve Young Plumbing & Heating Ltd | 4.8★ (83) | 16 km |
| Superior Plumbing & Heating of Ingersoll | 4.5★ (19) | 29 km |
| The Public Servant | 5.0★ (31) | In London |
How much do HVAC contractors cost in London?
US national ranges converted to CAD, not adjusted for London. 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 |
When to hire an HVAC contractor in Ontario
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.
How we ranked London HVAC contractors
We scored 129 London 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 London 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 |
HVAC contractors in London: frequently asked questions
Who is the best HVAC contractor in London?
By CR Score, the highest-ranked HVAC contractor in London, ON is Reliance London Heating, Air Conditioning & Plumbing with a CR Score of 68/100. It has 4.8★ from 12,217 Google reviews. It is open 24/7. Roy Inch & Sons Home Services by Enercare (#2) and Handy Bros. HVAC London (AC and Furnace Repair) (#3) follow. We ranked 129 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in London?
ContractorsRanked ranks 129 HVAC contractors serving London, ON. 42 of them are based in London; the rest serve it from nearby towns. Another 20 within 40 km are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in London are open 24/7?
55 ranked HVAC contractors in London post 24/7 hours. The highest-ranked are Reliance London Heating, Air Conditioning & Plumbing (#1), Roy Inch & Sons Home Services by Enercare (#2) and Handy Bros. HVAC London (AC and Furnace Repair) (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in London work on weekends?
75 of 129 ranked HVAC contractors post Saturday hours and 65 post Sunday hours. The highest-ranked open Saturdays are Reliance London Heating, Air Conditioning & Plumbing (#1), Roy Inch & Sons Home Services by Enercare (#2) and Handy Bros. HVAC London (AC and Furnace Repair) (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does ac replacement cost in London?
AC replacement typically costs CA$5,460 to CA$11,350, with CA$8,400 typical (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)). This is a national range, not adjusted for London. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do London HVAC contractors have?
The median Google rating among 129 rated HVAC contractors in London is 4.8★, with a median of 28 reviews. Reliance London Heating, Air Conditioning & Plumbing has the most, 12,217 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in London?
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.
How does ContractorsRanked rank HVAC contractors?
Each HVAC contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Update log for London
- October 2026: CR Scores recalculated for 129 hvac contractors serving London.
More HVAC contractors and London pages
HVAC contractors near London
- HVAC contractors in Dorchester, ON160 ranked
- HVAC contractors in St. Thomas, ON129 ranked
- HVAC contractors in Ingersoll, ON174 ranked
- HVAC contractors in Aylmer, ON134 ranked
- HVAC contractors in Woodstock, ON154 ranked
- HVAC contractors in South Huron, ON46 ranked
- HVAC contractors in Stratford, ON125 ranked
- HVAC contractors in Lambton Shores, ON29 ranked
- HVAC contractors in Bluewater, ON31 ranked
- HVAC contractors in New Hamburg, ON227 ranked
Other trades in London
- Roofers in London133 ranked
- Plumbers in London111 ranked
- Electricians in London95 ranked
- General contractors in London127 ranked
- Painters in London84 ranked
- Landscapers in London85 ranked
- Handymen in London34 ranked
- Kitchen remodelers in London86 ranked
- Bathroom remodelers in London89 ranked
- Flooring contractors in London75 ranked
- Tile installers in London28 ranked
- Drywall contractors in London16 ranked
- Concrete contractors in London81 ranked
- Fence contractors in London80 ranked
- Deck builders in London77 ranked
- Siding contractors in London48 ranked
- Window installers in London81 ranked
- Gutter installers in London47 ranked
- Insulation contractors in London24 ranked
- Solar installers in London13 ranked
- Garage door repair companies in London31 ranked
- Foundation repair companies in London32 ranked
- Tree services in London25 ranked
- Masonry contractors in London38 ranked
- Water damage restoration companies in London76 ranked
- Home builders in London109 ranked
- Demolition contractors in London20 ranked
- All contractors in London