218 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Durham: Heritage Home Service, CR Score 64/100; 4.9★ from 2,248 Google reviews; open 24/7.
Best for emergencies (open 24/7): Key Heating & Air Conditioning, posts 24/7 hours; ranked #2 of 218.
Most-reviewed: Heritage Home Service, 7,956 Google reviews at 4.8★, the most of 218 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
218 Durham HVAC contractors are ranked here by CR Score, from ten published factors. 58 are open 24/7, 86 open Saturdays and 66 open Sundays, based on posted hours. The median Google rating is 4.9★ across 218 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Heritage Home Service | 64 | 4.9★ (2,248) | Hampton, 11 mi away | 24/7 | Overall |
| 2 | Key Heating & Air Conditioning | 62 | 4.8★ (692) | Exeter, 10 mi away | 24/7 | Emergencies |
| 3 | Heritage Home Service | 61 | 4.8★ (7,956) | Auburn, 25 mi away | 24/7 | Most reviews |
| 4 | HeatPro HVAC | 61 | 4.8★ (138) | Chester, 5 mi away | 24/7 | — |
| 5 | Patriot Oil Burner Service | 59 | 5.0★ (263) | Chester, 21 mi away | 24/7 | — |
| 6 | East Coast Gas Fitters, LLC | 58 | 5.0★ (38) | Exeter, 9 mi away | 24/7 | — |
| 7 | Heritage Home Service | 58 | 4.9★ (45) | Portsmouth, 9 mi away | 24/7 | — |
| 8 | JP HVAC - Heating & Cooling | 58 | 5.0★ (35) | Exeter, 9 mi away | 24/7 | — |
| 9 | HVAC Plus LLC | 58 | 5.0★ (75) | Eliot, 2 mi away | Sat | — |
| 10 | HomeStyle Heating and Air LLC | 58 | 5.0★ (26) | Barrington, 8 mi 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 2,248 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 10 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 692 Google reviews, listed on Google as “HVAC contractor”.
Based in Auburn, 25 mi away
Ranked #3 because of its Google rating and review volume: 4.8★ from 7,956 Google reviews, the most in Durham.
Based in Chester, 5 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 138 Google reviews, listed on Google as “HVAC contractor”.
Based in Chester, 21 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 263 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 9 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “HVAC contractor”.
Based in Portsmouth, 9 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 45 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 9 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “HVAC contractor”.
Based in Eliot, 2 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 75 Google reviews, listed on Google as “HVAC contractor”.
Based in Barrington, 8 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “HVAC contractor”.
Based in Amesbury, 21 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.
Based in Barrington, 7 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Heating contractor”.
Based in Eliot, 14 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 12 mi away
Ranked #14 because of its Google rating and trade focus: 4.5★ from 83 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 11 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Heating contractor”.
Based in Sandown, 17 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “HVAC contractor”.
Based in Chester, 12 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “HVAC contractor”.
Based in Eliot, 2 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 58 Google reviews, listed on Google as “Plumber”.
Based in Merrimac, 21 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 96 Google reviews, listed on Google as “HVAC contractor”.
Based in Biddeford, 4 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “HVAC contractor”.
Based in South Berwick, 13 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 533 Google reviews, listed on Google as “HVAC contractor”.
Based in Portsmouth, 10 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 243 Google reviews, listed on Google as “HVAC contractor”.
Based in Biddeford, 20 mi away
Ranked #23 because of its Google rating and trade focus: 4.6★ from 163 Google reviews, listed on Google as “HVAC contractor”.
Based in Chester, 10 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 184 Google reviews, listed on Google as “HVAC contractor”.
Based in Rochester, 10 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 9 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 218 ranked HVAC contractors here; the rest are on their profiles.
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| A1 Restaurant Ventilation | 3.0★ (2) | 19 mi |
| All Purpose Mechanical | 4.5★ (2) | 17 mi |
| Berger HVAC, LLC | 3.0★ (4) | 16 mi |
| CALLAHAN OIL BURNER SERVICE'S | 4.7★ (12) | 24 mi |
| Coltella Heating & Cooling | 5.0★ (9) | 17 mi |
| Complete Home Services | 4.8★ (20) | 25 mi |
| Dan Rich Plumbing & Heating Co | 2.5★ (2) | 21 mi |
| David Glover Plumbing & Heating | 3.0★ (2) | 11 mi |
| Freeman Mechanical | 5.0★ (8) | 19 mi |
| Jim Tobey Plumbing & Heating | 3.0★ (2) | 12 mi |
| Kingdom Cooling | 4.5★ (15) | 24 mi |
| Krafton plumbing and heating | 5.0★ (2) | 16 mi |
| Mad Moose Mechanical | 5.0★ (14) | 25 mi |
| MANCO Hoods | 5.0★ (1) | 5 mi |
| Mc Nally & Sons Plumbing & Heating | 5.0★ (2) | 14 mi |
| Nadeau Gas & Oil Services, LLC | 5.0★ (2) | 8 mi |
| P.A.C.E Cooling & Heating, LLC | 5.0★ (9) | 21 mi |
| Plante Oil Burner Services | 3.0★ (2) | 21 mi |
| Spencer Deal Heating Services LLC | 4.0★ (2) | 20 mi |
| W. Fortune & Company | 5.0★ (1) | 5 mi |
National price ranges in USD, not adjusted for Durham. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
In New Hampshire, 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 218 Durham 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 Durham 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 |