673 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Merrimac: Heritage Home Service, CR Score 63/100; 4.9★ from 2,248 Google reviews; open 24/7.
Best for emergencies (open 24/7): Northeast Heating & Cooling, posts 24/7 hours; ranked #2 of 673.
Most-reviewed: Heritage Home Service, 7,956 Google reviews at 4.8★, the most of 673 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
673 Merrimac HVAC contractors are ranked here by CR Score, from ten published factors. 201 are open 24/7, 340 open Saturdays and 254 open Sundays, based on posted hours. The median Google rating is 4.9★ across 673 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Heritage Home Service | 63 | 4.9★ (2,248) | Hampton, 15 mi away | 24/7 | Overall |
| 2 | Northeast Heating & Cooling | 63 | 5.0★ (449) | Haverhill, 8 mi away | 24/7 | Emergencies |
| 3 | Heritage Home Service | 63 | 4.8★ (7,956) | Auburn, 20 mi away | 24/7 | Most reviews |
| 4 | Morris Plumbing, Heating & Air Conditioning | 62 | 5.0★ (582) | Andover, 11 mi away | 24/7 | — |
| 5 | NextGen Aire | 62 | 4.8★ (271) | Amesbury, 3 mi away | 24/7 | — |
| 6 | 128 Plumbing, Heating, Cooling & Electric | 62 | 5.0★ (562) | North Andover, 12 mi away | 24/7 | — |
| 7 | Cranney Home Services | 62 | 4.8★ (4,220) | Danvers, 18 mi away | 24/7 | — |
| 8 | Heritage Home Service | 62 | 4.8★ (3,352) | Wilmington, 18 mi away | 24/7 | — |
| 9 | MVP Home Services | 62 | 4.7★ (545) | Haverhill, 5 mi away | 24/7 | — |
| 10 | Modern Temperature Control | 62 | 4.9★ (96) | Merrimac | 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 Haverhill, 8 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 449 Google reviews, listed on Google as “HVAC contractor”.
Based in Auburn, 20 mi away
Ranked #3 because of its Google rating and review volume: 4.8★ from 7,956 Google reviews, the most in Merrimac.
Based in Andover, 11 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 582 Google reviews, listed on Google as “HVAC contractor”.
Based in Amesbury, 3 mi away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.
Based in North Andover, 12 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 562 Google reviews, listed on Google as “HVAC contractor”.
Based in Danvers, 18 mi away
Ranked #7 because of its Google rating and trade focus: 4.8★ from 4,220 Google reviews, listed on Google as “HVAC contractor”.
Based in Wilmington, 18 mi away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 3,352 Google reviews, listed on Google as “HVAC contractor”.
Based in Haverhill, 5 mi away
Ranked #9 because of its Google rating and trade focus: 4.7★ from 545 Google reviews, listed on Google as “HVAC contractor”.
Based in Merrimac
Ranked #10 because of its Google rating and trade focus: 4.9★ from 96 Google reviews, listed on Google as “HVAC contractor”.
Based in Wakefield, 23 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 3,912 Google reviews, listed on Google as “HVAC contractor”.
Based in Exeter, 12 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 692 Google reviews, listed on Google as “HVAC contractor”.
Based in Woburn, 23 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 3,169 Google reviews, listed on Google as “HVAC contractor”.
Based in Chelmsford, 23 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 2,927 Google reviews, listed on Google as “HVAC contractor”.
Based in Methuen, 11 mi away
Ranked #15 because of its Google rating and trade focus: 4.8★ from 313 Google reviews, listed on Google as “HVAC contractor”.
Based in Danvers, 19 mi away
Ranked #16 because of its Google rating and trade focus: 4.7★ from 1,672 Google reviews, listed on Google as “HVAC contractor”.
Based in Middleton, 18 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 491 Google reviews, listed on Google as “HVAC contractor”.
Based in Chester, 17 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 263 Google reviews, listed on Google as “HVAC contractor”.
Based in Peabody, 22 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 839 Google reviews, listed on Google as “HVAC contractor”.
Based in Billerica, 23 mi away
Ranked #20 because of its Google rating and trade focus: 4.8★ from 1,626 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Stoneham, 25 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 4,377 Google reviews, listed on Google as “HVAC contractor”.
Based in Billerica, 21 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 476 Google reviews, listed on Google as “Heating contractor”.
Based in Haverhill, 5 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “HVAC contractor”.
Based in Chelmsford, 22 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 443 Google reviews, listed on Google as “HVAC contractor”.
Based in Newburyport, 6 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 61 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 673 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) | 6 mi |
| All Purpose Mechanical | 4.5★ (2) | 7 mi |
| Bolla Electrical & HVAC Services | 5.0★ (2) | 6 mi |
| Buonagurio HVAC | 5.0★ (2) | 11 mi |
| Climate Design Systems, LLC | 4.3★ (89) | 13 mi |
| Dan Rich Plumbing & Heating Co | 2.5★ (2) | 7 mi |
| Denommee Plumbing, HVAC & Electric | 4.7★ (427) | 25 mi |
| Diamond Mechanical LLC | 4.5★ (83) | 13 mi |
| Jim Tobey Plumbing & Heating | 3.0★ (2) | 9 mi |
| Jordan Signature Heating | 5.0★ (21) | 11 mi |
| Just Great Plumbing and Heating LLC | 5.0★ (2) | 7 mi |
| Mc Nally & Sons Plumbing & Heating | 5.0★ (2) | 12 mi |
| Merrimack Valley Plumbing | 3.0★ (2) | 7 mi |
| Paone Mechanical Inc. | 4.9★ (190) | 23 mi |
| Revise Heating and Cooling | 5.0★ (2) | 6 mi |
| Sila Heating, Air Conditioning, Plumbing & Electrical | 4.7★ (483) | 24 mi |
| SPC Plumbing & Heating | 5.0★ (2) | 12 mi |
| Spencer Deal Heating Services LLC | 4.0★ (2) | 12 mi |
| Suspended Profile for Non Payment of Services - JP HVAC Services | 3.0★ (2) | 9 mi |
| Valerio Air Systems Inc | 3.0★ (2) | 12 mi |
National price ranges in USD, not adjusted for Merrimac. 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 Massachusetts, 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 673 Merrimac 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 Merrimac 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 |