573 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Ajax: Enercare, CR Score 66/100; 4.9★ from 8,942 Google reviews; open 24/7.
Best for emergencies (open 24/7): Limcan Certified Heating and Air Conditioning, posts 24/7 hours; ranked #2 of 573.
Most-reviewed: Enercare, 11,186 Google reviews at 4.8★, the most of 573 ranked; ranked #17.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
573 Ajax HVAC contractors are ranked here by CR Score, from ten published factors. 244 are open 24/7, 434 open Saturdays and 361 open Sundays, based on posted hours. The median Google rating is 4.9★ across 573 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Enercare | 66 | 4.9★ (8,942) | Oshawa, 14 km away | 24/7 | Overall |
| 2 | Limcan Certified Heating and Air Conditioning | 66 | 4.8★ (2,979) | Ajax | 24/7 | Emergencies |
| 3 | Enercare | 65 | 4.8★ (2,085) | Ajax | 24/7 | — |
| 4 | Button's Heating & Air Conditioning | 65 | 4.9★ (1,570) | Pickering, 3 km away | 24/7 | — |
| 5 | Reliance Heating, Air Conditioning & Plumbing | 65 | 4.8★ (6,966) | Oshawa, 12 km away | 24/7 | — |
| 6 | Advantage Airtech ClimateCare | 65 | 4.9★ (1,230) | Pickering, 3 km away | 24/7 | — |
| 7 | Climate Experts Heating & Cooling Inc. | 64 | 4.9★ (441) | Ajax | 24/7 | — |
| 8 | Infiniti Home Comfort | 64 | 4.9★ (417) | Ajax | 24/7 | — |
| 9 | Reliance Heating, Air Conditioning & Plumbing | 64 | 4.9★ (10,870) | Richmond Hill, 28 km away | 24/7 | — |
| 10 | Mersey Heating and Air Conditioning | 63 | 4.8★ (3,715) | Scarborough, 19 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 because of its Google rating and trade focus: 4.9★ from 8,942 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #2 because of its Google rating and trade focus: 4.8★ from 2,979 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #3 because of its Google rating and trade focus: 4.8★ from 2,085 Google reviews, listed on Google as “HVAC contractor”.
Based in Pickering, 3 km away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 1,570 Google reviews, listed on Google as “HVAC contractor”.
Based in Oshawa, 12 km away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 6,966 Google reviews, listed on Google as “HVAC contractor”.
Based in Pickering, 3 km away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 1,230 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #7 because of its Google rating and trade focus: 4.9★ from 441 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #8 because of its Google rating and trade focus: 4.9★ from 417 Google reviews, listed on Google as “HVAC contractor”.
Based in Richmond Hill, 28 km away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 10,870 Google reviews, listed on Google as “HVAC contractor”.
Based in Scarborough, 19 km away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 3,715 Google reviews, listed on Google as “HVAC contractor”.
Based in North York, 25 km away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 6,512 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #12 because of its Google rating and trade focus: 4.9★ from 233 Google reviews, listed on Google as “HVAC contractor”.
Ranked #13 because of its Google rating and trade focus: 4.8★ from 327 Google reviews, listed on Google as “Air conditioning contractor”.
Based in North York, 25 km away
Ranked #14 because of its Google rating and trade focus: 4.7★ from 9,158 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #15 because of its Google rating and trade focus: 5.0★ from 140 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #16 because of its Google rating and trade focus: 5.0★ from 97 Google reviews, listed on Google as “HVAC contractor”.
Based in North York, 37 km away
Ranked #17 because of its Google rating and review volume: 4.8★ from 11,186 Google reviews, the most in Ajax.
Based in Ajax
Ranked #18 because of its Google rating and trade focus: 5.0★ from 73 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #19 because of its Google rating and trade focus: 4.9★ from 92 Google reviews, listed on Google as “HVAC contractor”.
Based in Oshawa, 15 km away
Ranked #20 because of its Google rating and trade focus: 4.8★ from 708 Google reviews, listed on Google as “HVAC contractor”.
Based in Pickering, 4 km away
Ranked #21 because of its Google rating and trade focus: 4.7★ from 251 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #22 because of its Google rating and trade focus: 4.8★ from 90 Google reviews, listed on Google as “HVAC contractor”.
Based in Ajax
Ranked #23 because of its Google rating and trade focus: 5.0★ from 49 Google reviews, listed on Google as “HVAC contractor”.
Based in Markham, 24 km away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 1,319 Google reviews, listed on Google as “HVAC contractor”.
Based in Markham, 24 km away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 836 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 573 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 |
|---|---|---|
| Air Flex Heating & Cooling Ltd | In Ajax | |
| Aire One Heating & Cooling | 4.8★ (480) | 26 km |
| Arctic Mechanical Technologies Inc | In Ajax | |
| ARH SOLUTIONS | In Ajax | |
| Chamba Brothers Heating and Cooling | 5.0★ (1) | In Ajax |
| DCI Heating Ltd | 1.0★ (1) | In Ajax |
| Enercare | 4.7★ (1,470) | 31 km |
| Enviroaire Mechanical & Electrical | 5.0★ (2) | 12 km |
| Guardian Angel Heating & Air | In Ajax | |
| HI TECH HOME COMFORT HEATING COOLING | 4.7★ (22) | In Ajax |
| HVAC Contractor Ajax | In Ajax | |
| IECS | 4.0★ (1) | In Ajax |
| JA Plumbing and Drain | 5.0★ (1) | In Ajax |
| MAAS Trust Concrete Inc | Construction Company in Whitby & Mississauga | Licensed Master Electrician & Plumber | 5.0★ (2) | 10 km |
| National Home Services | 5.0★ (1) | In Ajax |
| One Call Plumbers | 4.9★ (38) | In Ajax |
| Pro Desk at RONA+ | 3.0★ (2) | 3 km |
| Riley Group Electrical Limited - Licensed Electricians | 5.0★ (40) | In Ajax |
| SMART TECH HEATING AND COOLING INC | 5.0★ (2) | In Ajax |
| VR Mechanical Solutions | 4.4★ (17) | In Ajax |
US national ranges converted to CAD, not adjusted for Ajax. 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 573 Ajax 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 Ajax 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 |