95/100CR Score
Ranked #1 because of its Google rating and availability: 4.9★ from 8,942 Google reviews, open 24/7.
- 4.9★ from 8,942 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 285 Bloor St W, Oshawa, ON L1J 1R1
Best HVAC Contractors in Oshawa, ON (2026)
274 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Oshawa: Enercare, CR Score 95/100; 4.9★ from 8,942 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Reliance Heating, Air Conditioning & Plumbing, posts 24/7 hours; ranked #2 of 274.
- 2
Most-reviewed: Reliance Heating, Air Conditioning & Plumbing, 6,966 Google reviews at 4.8★, the most of 274 ranked after Enercare; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
274 Oshawa HVAC contractors are ranked here by CR Score, from 8 published factors. 115 are open 24/7, 202 open Saturdays and 171 open Sundays, based on posted hours. The median Google rating is 4.9★ across 274 rated businesses.
Top 10 HVAC contractors in Oshawa at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Enercare | 95 | 4.9★ (8,942) | Oshawa | 24/7 | Overall |
| 2 | Reliance Heating, Air Conditioning & Plumbing | 94 | 4.8★ (6,966) | Oshawa | 24/7 | Emergencies, Most reviews |
| 3 | Joe's Heating and Air Conditioning | 92 | 4.9★ (725) | Oshawa | 24/7 | — |
| 4 | Limcan Certified Heating and Air Conditioning | 92 | 4.8★ (2,979) | Ajax, 6 km away | 24/7 | — |
| 5 | Ashton Heating & Cooling | 91 | 4.9★ (512) | Oshawa | 24/7 | — |
| 6 | Daly Home Comfort | 91 | 5.0★ (247) | Oshawa | 24/7 | — |
| 7 | Limcan Certified Heating and Air Conditioning | 91 | 4.8★ (708) | Oshawa | 24/7 | — |
| 8 | DC Comfort Air | 90 | 5.0★ (145) | Oshawa | 24/7 | — |
| 9 | Infiniti Home Comfort | 90 | 4.9★ (417) | Ajax, 6 km away | 24/7 | — |
| 10 | Button's Heating & Air Conditioning | 90 | 4.9★ (1,570) | Pickering, 18 km away | 24/7 | — |
The 274 best HVAC contractors in Oshawa, ranked
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Oshawa
94/100CR ScoreRanked #2 because of its Google rating and availability: 4.8★ from 6,966 Google reviews, open 24/7.
- 4.8★ from 6,966 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1155 Boundary Rd Unit 8, Oshawa, ON L1J 6Z7
Based in Oshawa
92/100CR ScoreRanked #3 because of its Google rating and availability: 4.9★ from 725 Google reviews, open 24/7.
- 4.9★ from 725 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 221 Lake Rd Unit 1 & 2, Bowmanville, ON L1C 4P8
Based in Ajax, 6 km away
92/100CR ScoreRanked #4 because of its Google rating and availability: 4.8★ from 2,979 Google reviews, open 24/7.
- 4.8★ from 2,979 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 105 Consumers Dr Unit L, Whitby, ON L1N 2C2
Based in Oshawa
91/100CR ScoreRanked #5 because of its Google rating and availability: 4.9★ from 512 Google reviews, open 24/7.
- 4.9★ from 512 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3621 Courtice Rd, Courtice, ON L1E 2L6
Based in Oshawa
91/100CR ScoreRanked #6 because of its Google rating and availability: 5.0★ from 247 Google reviews, open 24/7.
- 5.0★ from 247 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 61 Cherry Blossom Crescent, Courtice, ON L1E 1G6
Based in Oshawa
91/100CR ScoreRanked #7 because of its Google rating and availability: 4.8★ from 708 Google reviews, open 24/7.
- 4.8★ from 708 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 501 Ritson Rd S Unit 1, Oshawa, ON L1H 3B5
Based in Oshawa
90/100CR ScoreRanked #8 because of its Google rating and availability: 5.0★ from 145 Google reviews, open 24/7.
- 5.0★ from 145 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Ajax, 6 km away
90/100CR ScoreRanked #9 because of its Google rating and availability: 4.9★ from 417 Google reviews, open 24/7.
- 4.9★ from 417 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1621 McEwen Dr Unit 35, Whitby, ON L1N 9A5
Based in Pickering, 18 km away
90/100CR ScoreRanked #10 because of its Google rating and availability: 4.9★ from 1,570 Google reviews, open 24/7.
- 4.9★ from 1,570 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1895 Clements Rd Unit 170, Pickering, ON L1W 3V5
Based in Oshawa
90/100CR ScoreRanked #11 because of its Google rating and availability: 4.9★ from 180 Google reviews, open 24/7.
- 4.9★ from 180 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1700 Baseline Rd W, Courtice, ON L1E 2S8
Based in Pickering, 18 km away
89/100CR ScoreRanked #12 because of its Google rating and availability: 4.9★ from 1,230 Google reviews, open 24/7.
- 4.9★ from 1,230 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1895 Clements Rd #136, Pickering, ON L1W 3V5
Based in Oshawa
89/100CR ScoreRanked #13 because of its Google rating and availability: 5.0★ from 96 Google reviews, open 24/7.
- 5.0★ from 96 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 105 Consumers Dr Unit # 2, Whitby, ON L1N 2C2
Based in Ajax, 4 km away
89/100CR ScoreRanked #14 because of its Google rating and availability: 4.8★ from 327 Google reviews, open 24/7.
- 4.8★ from 327 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1910 Dundas St E #117, Whitby, ON L1N 2L6
#15 Lazzaro Gas HVAC
Based in Ajax, 6 km away
89/100CR ScoreRanked #15 because of its Google rating and availability: 5.0★ from 140 Google reviews, open 24/7.
- 5.0★ from 140 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6 Michelle Ct, Whitby, ON L1N 6Z1
Based in Ajax, 13 km away
89/100CR ScoreRanked #16 because of its Google rating and availability: 4.9★ from 441 Google reviews, open 24/7.
- 4.9★ from 441 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Oshawa
88/100CR ScoreRanked #17 because of its Google rating and availability: 5.0★ from 47 Google reviews, open 24/7.
- 5.0★ from 47 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 303 Wilson Rd N, Oshawa, ON L1G 6E4
Based in Oshawa
88/100CR ScoreRanked #18 because of its Google rating and availability: 5.0★ from 46 Google reviews, open 24/7.
- 5.0★ from 46 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 202 King St E Unit 11, Oshawa, ON L1H 1C4
#19 AOBUTEC
Based in Ajax, 8 km away
87/100CR ScoreRanked #19 because of its Google rating and availability: 4.9★ from 92 Google reviews, open 24/7.
- 4.9★ from 92 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 430 Brock St N, Whitby, ON L1N 4H9
Based in Scarborough, 34 km away
87/100CR ScoreRanked #20 because of its Google rating and availability: 4.8★ from 3,715 Google reviews, open 24/7.
- 4.8★ from 3,715 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1960 Ellesmere Rd Unit 6, Scarborough, ON M1P 3C2
#21 Enercare
Based in Ajax, 31 km away
87/100CR ScoreRanked #21 because of its Google rating and availability: 4.8★ from 2,085 Google reviews, open 24/7.
- 4.8★ from 2,085 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Ajax, 14 km away
87/100CR ScoreRanked #22 because of its Google rating and availability: 5.0★ from 97 Google reviews, open 24/7.
- 5.0★ from 97 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2, 157C Harwood Ave N Suite #389, Ajax, ON L1Z 0B6
Based in Oshawa
87/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 468 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 468 Google reviews
- Hours
- Mon–Fri 8 AM–10 PM · Sat–Sun 9 AM–5 PM
- Address
- 105 Industrial Dr, Whitby, ON L1N 5Z9
#24 Right Price HVAC
Based in Oshawa
87/100CR ScoreRanked #24 because of its Google rating and availability: 5.0★ from 24 Google reviews, open 24/7.
- 5.0★ from 24 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Oshawa
87/100CR ScoreRanked #25 because of its Google rating and availability: 5.0★ from 23 Google reviews, open 24/7.
- 5.0★ from 23 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 715 Phillip Murray Ave, Oshawa, ON L1J 1J2
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 274 ranked HVAC contractors here; the rest are on their profiles.
Also serving Oshawa
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 |
|---|---|---|
| Aire One East | 5.0★ (2) | In Oshawa |
| ATK Plumbing and Heating INC. | 5.0★ (43) | In Oshawa |
| Comfort Masters | In Oshawa | |
| Comfort Trust Ltd. | 5.0★ (1) | In Oshawa |
| DALY HOME COMFORT | 5.0★ (2) | In Oshawa |
| Doug Scott Heating and Cooling | 4.8★ (19) | In Oshawa |
| Durham HVAC | In Oshawa | |
| Efren's Heating and Cooling | 5.0★ (2) | In Oshawa |
| Enviroaire Mechanical & Electrical | 5.0★ (2) | In Oshawa |
| Everest Drain & Plumbing: Oshawa's Local Plumber | 5.0★ (2) | In Oshawa |
| Hatco HVAC | 4.9★ (53) | 22 km |
| Hughes Mechanical | In Oshawa | |
| HVAC Installs | 4.8★ (6) | In Oshawa |
| Just Right Air Systems | 5.0★ (22) | 17 km |
| MAAS Trust Concrete Inc | Construction Company in Whitby & Mississauga | Licensed Master Electrician & Plumber | 5.0★ (2) | In Oshawa |
| Oshawa Refrigeration Svc | 3.0★ (2) | In Oshawa |
| RITE-TEMP Heating and Air Conditioning | 5.0★ (4) | In Oshawa |
| Service Express HVAC | 4.9★ (384) | 39 km |
| Superior Care Home Services Inc. | 5.0★ (266) | 40 km |
| T&D Thermal Systems | 5.0★ (2) | In Oshawa |
How much do HVAC contractors cost in Oshawa?
US national ranges converted to CAD, not adjusted for Oshawa. 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 Oshawa HVAC contractors
We scored 274 Oshawa HVAC contractors on 8 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. Unknown factors are left out of the score, 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 Oshawa data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |
HVAC contractors in Oshawa: frequently asked questions
Who is the best HVAC contractor in Oshawa?
By CR Score, the highest-ranked HVAC contractor in Oshawa, ON is Enercare with a CR Score of 95/100. It has 4.9★ from 8,942 Google reviews. It is open 24/7. Reliance Heating, Air Conditioning & Plumbing (#2) and Joe's Heating and Air Conditioning (#3) follow. We ranked 274 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Oshawa?
ContractorsRanked ranks 274 HVAC contractors serving Oshawa, ON. 31 of them are based in Oshawa; 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 Oshawa are open 24/7?
115 ranked HVAC contractors in Oshawa post 24/7 hours. The highest-ranked are Enercare (#1), Reliance Heating, Air Conditioning & Plumbing (#2) and Joe's Heating and Air Conditioning (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Oshawa work on weekends?
202 of 274 ranked HVAC contractors post Saturday hours and 171 post Sunday hours. The highest-ranked open Saturdays are Enercare (#1), Reliance Heating, Air Conditioning & Plumbing (#2) and Joe's Heating and Air Conditioning (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does ac replacement cost in Oshawa?
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 Oshawa. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Oshawa HVAC contractors have?
The median Google rating among 274 rated HVAC contractors in Oshawa is 4.9★, with a median of 31 reviews. Enercare has the most, 8,942 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 Oshawa?
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 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Update log for Oshawa
- October 2026: CR Scores recalculated for 274 hvac contractors serving Oshawa.
- October 2026: 2 duplicate listings merged.
More HVAC contractors and Oshawa pages
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