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Best HVAC Contractors in Portsmouth, NH (2026)

173 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Portsmouth: Heritage Home Service, CR Score 66/100; 4.9★ from 2,248 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Key Heating & Air Conditioning, posts 24/7 hours; ranked #2 of 173.

  3. 2

    Most-reviewed: Key Heating & Air Conditioning, 692 Google reviews at 4.8★, the most of 173 ranked after Heritage Home Service; ranked #2.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

173 Portsmouth HVAC contractors are ranked here by CR Score, from ten published factors. 42 are open 24/7, 68 open Saturdays and 53 open Sundays, based on posted hours. The median Google rating is 4.9★ across 173 rated businesses.

Top 10 HVAC contractors in Portsmouth at a glance

Top 10 HVAC contractors in Portsmouth at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Heritage Home Service664.9★ (2,248)Hampton, 7 mi away24/7Overall
2Key Heating & Air Conditioning634.8★ (692)Exeter, 12 mi away24/7Emergencies, Most reviews
3Heritage Home Service614.9★ (45)Portsmouth24/7—
4HeatPro HVAC604.8★ (138)Chester, 10 mi away24/7—
5MCP HVAC605.0★ (243)Portsmouth——
6East Coast Gas Fitters, LLC595.0★ (38)Exeter, 9 mi away24/7—
7NextGen Aire594.8★ (271)Amesbury, 20 mi away24/7—
8CircumVent LLC595.0★ (40)Eliot, 11 mi away24/7—
9JP HVAC - Heating & Cooling585.0★ (35)Exeter, 12 mi away24/7—
10Integrity Comfort Heating And Cooling585.0★ (533)South Berwick, 12 mi away——

The 173 best HVAC contractors in Portsmouth, ranked

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.

  1. Ranked #1 in Portsmouth

    #1 Heritage Home Service

    Based in Hampton, 7 mi away

    66/100CR Score

    Ranked #1 because of its Google rating and review volume: 4.9★ from 2,248 Google reviews, the most in Portsmouth.

    • 4.9★ from 2,248 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    179 Lafayette Rd, North Hampton, NH 03862
    View profile for Heritage Home Service(603) 370-5097

  4. #4 HeatPro HVAC

    Based in Chester, 10 mi away

    60/100CR Score

    Ranked #4 because of its Google rating and trade focus: 4.8★ from 138 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 138 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for HeatPro HVAC(603) 923-3103

  5. #5 MCP HVAC

    Based in Portsmouth

    60/100CR Score

    Ranked #5 because of its Google rating and trade focus: 5.0★ from 243 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 243 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun closed
    Address
    3601 Lafayette Rd, Portsmouth, NH 03801
    View profile for MCP HVAC(603) 501-9454

  7. #7 NextGen Aire

    Based in Amesbury, 20 mi away

    59/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.8★ from 271 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 271 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    31 S Hunt Rd, Amesbury, MA 01913
    View profile for NextGen Aire(978) 566-9601

  8. #8 CircumVent LLC

    Based in Eliot, 11 mi away

    59/100CR Score

    Ranked #8 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 40 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for CircumVent LLC(207) 977-4143

  11. #11 HomeWiz

    Based in Biddeford, 17 mi away

    58/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.6★ from 163 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 163 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    694 Post Rd, Wells, ME 04090
    View profile for HomeWiz(207) 506-2232

  12. #12 Townsend Energy

    Based in Portsmouth

    58/100CR Score

    Ranked #12 because of its Google rating and trade focus: 3.7★ from 71 Google reviews, listed on Google as “HVAC contractor”.

    • 3.7★ from 71 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    225 Greenleaf Ave, Portsmouth, NH 03801
    View profile for Townsend Energy(603) 379-3655

  16. #16 HVAC Plus LLC

    Based in Eliot, 11 mi away

    57/100CR Score

    Ranked #16 because of its Google rating and trade focus: 5.0★ from 75 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 75 Google reviews
    Hours
    Mon–Fri 6 AM–5 PM · Sat 6 AM–12 PM · Sun closed
    View profile for HVAC Plus LLC(603) 534-8687

  18. #18 Pilot Plumbing, Heating and Cooling | Plumber, Tankless Water Heater Repair & Installation | Heating & AC Repair Sandown, NH

    Based in Sandown, 22 mi away

    57/100CR Score

    Ranked #18 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 51 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    265 Fremont Rd, Sandown, NH 03873
    View profile for Pilot Plumbing, Heating and Cooling | Plumber, Tankless Water Heater Repair & Installation | Heating & AC Repair Sandown, NH(603) 634-8531

  20. #20 Kearney HVAC Inc

    Based in Amesbury, 16 mi away

    56/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.9★ from 440 Google reviews, listed on Google as “Heating contractor”.

    • 4.9★ from 440 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    158 Lafayette Rd, Salisbury, MA 01952
    View profile for Kearney HVAC Inc(978) 363-6106

  21. #21 Linscott Electric, LLC

    Based in South Berwick, 14 mi away

    56/100CR Score

    Ranked #21 because of its Google rating and trade focus: 5.0★ from 243 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 243 Google reviews
    Hours
    Mon–Fri 7 AM–4 PM · Sat–Sun closed
    Address
    69 Boyds Corner Rd, South Berwick, ME 03908
    View profile for Linscott Electric, LLC(207) 450-2964

  23. #23 Dry Air Systems Inc

    Based in Newburyport, 20 mi away

    56/100CR Score

    Ranked #23 because of its Google rating and trade focus: 4.7★ from 61 Google reviews, listed on Google as “HVAC contractor”.

    • 4.7★ from 61 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3 Stanley Tucker Dr, Newburyport, MA 01950
    View profile for Dry Air Systems Inc(978) 948-2151

  25. #25 Main Stream Mechanical

    Based in Amesbury, 18 mi away

    56/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.9★ from 137 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 137 Google reviews
    Hours
    Mon–Fri 7 AM–6 PM · Sat 8 AM–4 PM · Sun closed
    Address
    25 Macy St Suite C, Amesbury, MA 01913
    View profile for Main Stream Mechanical(978) 834-0849

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 173 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Portsmouth, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Palmer and Sicard, Inc.563.9★ (20)10 mi
27T&R Oil Burner Service565.0★ (14)16 mi
28Coastal Mechanical565.0★ (184)16 mi
29P Gagnon & Son554.5★ (487)11 mi
30BRR HVAC/R555.0★ (5)10 mi
31Linscott Electric, LLC555.0★ (22)In Portsmouth
32Comfort Services LLC555.0★ (22)21 mi
33Traditional Oil Heating Services555.0★ (33)25 mi
34TR Morin Plumbing, Heating & Air Conditioning555.0★ (6)6 mi
35SRV Plumbing and Heating555.0★ (58)15 mi
36Heating contractor555.0★ (10)11 mi
37Comfort Air Services555.0★ (41)15 mi
38Courtesy Heating and Cooling545.0★ (16)15 mi
39Gerry's Gas Services545.0★ (53)10 mi
40Fallon's Home & Hearth544.4★ (128)12 mi
41Stevens Mechanical544.9★ (9)18 mi
42Greater Seacoast HVAC544.5★ (8)17 mi
43Heating & Air Conditioning Service544.8★ (31)20 mi
44Duct Dusters HVAC LLC545.0★ (81)18 mi
45Garrison City HVAC-R545.0★ (28)9 mi
46Affordable Oil534.3★ (21)11 mi
47Cold Creek HVAC535.0★ (5)18 mi
48Atlantic Fuels534.3★ (57)6 mi
49Murphy's HVAC LLC535.0★ (11)24 mi
50Blue's Mini Splits535.0★ (34)19 mi

Also serving Portsmouth

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.

Unranked HVAC contractors serving Portsmouth
BusinessGoogle ratingDistance
All Purpose Mechanical4.5★ (2)19 mi
Berry & Jones Plumbing & Heating5.0★ (1)In Portsmouth
CALLAHAN OIL BURNER SERVICE'S4.7★ (12)24 mi
Clem's Plumbing & Heating3.7★ (3)13 mi
CMC Mechanical Services LLCIn Portsmouth
Dan Rich Plumbing & Heating Co2.5★ (2)17 mi
David Glover Plumbing & Heating3.0★ (2)20 mi
Freeman Mechanical5.0★ (8)24 mi
Green Home Climate SolutionsIn Portsmouth
Jim Tobey Plumbing & Heating3.0★ (2)14 mi
M&K Plumbing & Heating4.3★ (11)22 mi
Maffei Services4.7★ (848)25 mi
Marine Refrigeration & Air Conditioning5.0★ (3)18 mi
Mc Nally & Sons Plumbing & Heating5.0★ (2)10 mi
MechairneIn Portsmouth
Nadeau Gas & Oil Services, LLC5.0★ (2)14 mi
Port City Plumbing3.7★ (31)In Portsmouth
R Currier's Plumbing & HeatingIn Portsmouth
Ted Karmeris Dependable Heating4.8★ (16)20 mi
Thermidyne HVACRIn Portsmouth

How much do HVAC contractors cost in Portsmouth?

National price ranges in USD, not adjusted for Portsmouth. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Portsmouth?
JobLowTypicalHighBasisChecked
AC replacement$3,887$5,978$8,073Per system, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026
Furnace replacement$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs. US national rangeOctober 2026

When to hire an HVAC contractor in New Hampshire

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.

How we ranked Portsmouth HVAC contractors

We scored 173 Portsmouth 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Portsmouth data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

HVAC contractors in Portsmouth: frequently asked questions

Who is the best HVAC contractor in Portsmouth?

By CR Score, the highest-ranked HVAC contractor in Portsmouth, NH is Heritage Home Service with a CR Score of 66/100. It has 4.9★ from 2,248 Google reviews. It is open 24/7. Key Heating & Air Conditioning (#2) and Heritage Home Service (#3) follow. We ranked 173 HVAC contractors on ten factors, last updated October 22, 2026.

How many HVAC contractors are there in Portsmouth?

ContractorsRanked ranks 173 HVAC contractors serving Portsmouth, NH. 5 of them are based in Portsmouth; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Portsmouth are open 24/7?

42 ranked HVAC contractors in Portsmouth post 24/7 hours. The highest-ranked are Heritage Home Service (#1), Key Heating & Air Conditioning (#2) and Heritage Home Service (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Portsmouth work on weekends?

68 of 173 ranked HVAC contractors post Saturday hours and 53 post Sunday hours. The highest-ranked open Saturdays are Heritage Home Service (#1), Key Heating & Air Conditioning (#2) and Heritage Home Service (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does ac replacement cost in Portsmouth?

AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Portsmouth. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Portsmouth HVAC contractors have?

The median Google rating among 173 rated HVAC contractors in Portsmouth is 4.9★, with a median of 13 reviews. Heritage Home Service has the most, 2,248 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 Portsmouth?

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.

How does ContractorsRanked rank HVAC contractors?

Each HVAC contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Update log for Portsmouth

  1. October 2026: CR Scores recalculated for 173 hvac contractors serving Portsmouth.
  2. October 2026: 3 duplicate listings merged.

More HVAC contractors and Portsmouth pages

Other trades in Portsmouth