46 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Corunna: Reliance Home Comfort, CR Score 94/100; 4.8★ from 3,256 Google reviews; open 24/7.
Best for emergencies (open 24/7): It's Your Heating And Cooling Guy, posts 24/7 hours; ranked #2 of 46.
Most-reviewed: Vincent's Heating & Plumbing Inc, 997 Google reviews at 4.8★, the most of 46 ranked after Reliance Home Comfort; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
46 Corunna HVAC contractors are ranked here by CR Score, from 8 published factors. 16 are open 24/7, 24 open Saturdays and 21 open Sundays, based on posted hours. The median Google rating is 4.9★ across 46 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Reliance Home Comfort | 94 | 4.8★ (3,256) | Sarnia, 10 km away | 24/7 | Overall |
| 2 | It's Your Heating And Cooling Guy | 92 | 4.9★ (739) | Port Huron, 9 km away | 24/7 | Emergencies |
| 3 | Vincent's Heating & Plumbing Inc | 92 | 4.8★ (997) | Port Huron, 9 km away | 24/7 | Most reviews |
| 4 | Dependable Heating Cooling & Refrigeration | 92 | 4.9★ (707) | Sarnia, 13 km away | 24/7 | — |
| 5 | Handy Bros. HVAC Sarnia (AC and Furnace Repair) | 91 | 4.9★ (312) | Sarnia, 10 km away | 24/7 | — |
| 6 | Stewart Adams & Son Heating & Air Conditioning LLC | 91 | 5.0★ (200) | Port Huron, 11 km away | 24/7 | — |
| 7 | Superior Heating & Cooling Inc. | 90 | 4.9★ (191) | Port Huron, 11 km away | 24/7 | — |
| 8 | Bright's Grove Heating & Cooling (AC and Furnace Repair) | 89 | 5.0★ (166) | Sarnia, 22 km away | 24/7 | — |
| 9 | Complete Heat & Air conditioning Inc. | 87 | 5.0★ (73) | Corunna | Sat · Sun · Evenings | — |
| 10 | Superior Plumbing & Heating of Sarnia | 86 | 5.0★ (20) | Sarnia, 10 km away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 4.8★ from 3,256 Google reviews, the most Google reviews on this list (3,256).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Huron, 9 km away
Ranked #2 because of its Google rating and availability: 4.9★ from 739 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Huron, 9 km away
Ranked #3 because of its Google rating and availability: 4.8★ from 997 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 13 km away
Ranked #4 because of its Google rating and availability: 4.9★ from 707 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 10 km away
Ranked #5 because of its Google rating and availability: 4.9★ from 312 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Huron, 11 km away
Ranked #6 because of its Google rating and availability: 5.0★ from 200 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Huron, 11 km away
Ranked #7 because of its Google rating and availability: 4.9★ from 191 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 22 km away
Ranked #8 because of its Google rating and availability: 5.0★ from 166 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Corunna
Ranked #9 because of its Google rating and trade focus: 5.0★ from 73 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 10 km away
Ranked #10 because of its Google rating and availability: 5.0★ from 20 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petrolia, 23 km away
Ranked #11 because of its Google rating and availability: 4.8★ from 37 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 12 km away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Richmond, 27 km away
Ranked #13 because of its Google rating and availability: 5.0★ from 29 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in New Baltimore, 36 km away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 111 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Huron, 22 km away
Ranked #15 because of its Google rating and trade focus: 4.8★ from 71 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Marysville, 6 km away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Heating contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in New Baltimore, 40 km away
Ranked #17 because of its Google rating and availability: 5.0★ from 21 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in New Baltimore, 33 km away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 491 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petrolia, 23 km away
Ranked #19 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Richmond, 28 km away
Ranked #20 because of its Google rating and availability: 5.0★ from 3 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in New Baltimore, 36 km away
Ranked #21 because of its Google rating and availability: 4.6★ from 10 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Richmond, 28 km away
Ranked #22 because of its Google rating and availability: 3.5★ from 4 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 13 km away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 134 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sarnia, 10 km away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 76 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Camlachie, 28 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “HVAC contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
#1 to #25 are shown in full above. Here are #31 to #43, in CR Score order; each links to its profile. We publish the top 43 of 46 ranked HVAC contractors here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 31 | Royal heating and cooling | 75 | 5.0★ (4) | 28 km |
| 33 | Mc Cormick Heating | 74 | 5.0★ (4) | 22 km |
| 43 | Mark's Plumbing & Heating | 70 | 5.0★ (3) | 26 km |
US national ranges converted to CAD, not adjusted for Corunna. 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 46 Corunna 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 Corunna 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 |