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Emergency HVAC Contractors in Portsmouth, NH (2026)

Top 50 of 173 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Portsmouth: Heritage Home Service, open 24/7.

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

Top emergency HVAC contractors in Portsmouth at a glance

Top emergency HVAC contractors in Portsmouth at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Heritage Home Service674.9★ (2,248)Hampton, 7 mi away24/7
2Key Heating & Air Conditioning634.8★ (692)Exeter, 12 mi away24/7
3Heritage Home Service624.9★ (45)Portsmouth24/7
4HeatPro HVAC614.8★ (138)Chester, 10 mi away24/7
5Townsend Energy603.7★ (71)Portsmouth24/7
6NextGen Aire604.8★ (271)Amesbury, 20 mi away24/7
7East Coast Gas Fitters, LLC605.0★ (38)Exeter, 9 mi away24/7
8CircumVent LLC595.0★ (40)Eliot, 11 mi away24/7
9HomeWiz594.6★ (163)Biddeford, 17 mi away24/7
10JP HVAC - Heating & Cooling595.0★ (35)Exeter, 12 mi away24/7

Call an emergency HVAC contractor in Portsmouth now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Portsmouth, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 173 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  4. #4 HeatPro HVAC

    Based in Chester, 10 mi away

    61/100CR 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 Townsend Energy

    Based in Portsmouth

    60/100CR Score

    Ranked #5 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

  6. #6 NextGen Aire

    Based in Amesbury, 20 mi away

    60/100CR Score

    Ranked #6 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

  9. #9 HomeWiz

    Based in Biddeford, 17 mi away

    59/100CR Score

    Ranked #9 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

  16. #16 Dry Air Systems Inc

    Based in Newburyport, 20 mi away

    57/100CR Score

    Ranked #16 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

  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

  22. #22 BRR HVAC/R

    Based in Biddeford, 10 mi away

    56/100CR Score

    Ranked #22 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 5 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for BRR HVAC/R(207) 494-4334

Top 50 of 173 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Portsmouth, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Stevens Mechanical554.9★ (9)18 mi
27Greater Seacoast HVAC554.5★ (8)17 mi
28Cold Creek HVAC545.0★ (5)18 mi
29Minotaur Heating and Cooling HVAC Systems545.0★ (5)19 mi
30Maffei Services544.7★ (848)25 mi
31Murphy's HVAC LLC545.0★ (11)24 mi
32CALLAHAN OIL BURNER SERVICE'S534.7★ (12)24 mi
33Tremblay & Son HVAC533.3★ (12)21 mi
34Freeman Mechanical535.0★ (8)24 mi
35Marine Refrigeration & Air Conditioning535.0★ (3)18 mi
36Freedom Air Mechanical, LLC534.6★ (8)24 mi
37Alpha Charlie HVAC535.0★ (4)21 mi
38Fabrizio John Plumbing and Heating534.5★ (8)10 mi
39Clem's Plumbing & Heating503.7★ (3)13 mi
40M&K Plumbing & Heating504.3★ (11)22 mi
41Rousseau Electric LLC494.8★ (21)19 mi
42Coppersmith Electric, Inc495.0★ (20)21 mi
43Affordable Oil474.3★ (21)11 mi
44MCP HVAC465.0★ (243)In Portsmouth
45Brulotte Inc455.0★ (4)11 mi
46Integrity Comfort Heating And Cooling455.0★ (533)12 mi
47Ted Karmeris Dependable Heating454.8★ (16)20 mi
48Cammett Heating Service444.8★ (4)14 mi
49Piller Heating Co445.0★ (4)14 mi
50Rymes Propane & Oil442.8★ (49)15 mi

How we ranked emergency HVAC contractors in Portsmouth

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

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 from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Portsmouth: questions

Which HVAC contractors in Portsmouth are open 24/7?

25 on this list post 24/7 hours, including Heritage Home Service, Key Heating & Air Conditioning, Heritage Home Service, HeatPro HVAC and Townsend Energy.

Who is ranked #1 for emergency heating and cooling in Portsmouth, NH?

Heritage Home Service is #1, with a CR Score of 67 out of 100 on emergency weights.

How are emergency HVAC contractors in Portsmouth ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Portsmouth

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

More emergency and heating and cooling pages