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Emergency HVAC Contractors in Merrimack, NH (2026)

Top 50 of 526 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 Merrimack: 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 Merrimack at a glance

Top emergency HVAC contractors in Merrimack at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Heritage Home Service944.8★ (7,956)Auburn, 10 mi away24/7
2High Ground Service Pros - Plumbers Electricians & HVAC Technicians934.9★ (2,303)Manchester, 9 mi away24/7
3Sanford Temperature Control924.9★ (1,832)Milford, 11 mi away24/7
4Walley's Heating & Air914.9★ (793)Nashua, 8 mi away24/7
5A.J. LeBlanc Heating, A/C, Plumbing & Electrical914.8★ (683)Bedford, 7 mi away24/7
6A. Fagundes Plumbing & Heating Inc.904.9★ (348)Nashua, 6 mi away24/7
7Wilson Brothers Heating & Air Conditioning, Inc.904.9★ (1,275)Fitchburg, 14 mi away24/7
8Ferris Plumbing, Heating & Air904.9★ (320)Litchfield, 6 mi away24/7
9LHR Plumbing Heating Cooling and Electric904.9★ (454)Manchester, 8 mi away24/7
10A. Fagundes Plumbing & Heating Inc.904.8★ (1,626)Billerica, 15 mi away24/7

Call an emergency HVAC contractor in Merrimack 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 Merrimack, 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 526 is on the HVAC contractors page.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

Top 50 of 526 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 Merrimack, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Ferris Plumbing, Heating & Air874.9★ (77)10 mi
27Advanced Quality Air874.8★ (20)2 mi
28Done right plumbing heating cooling875.0★ (46)8 mi
29City Fuel874.6★ (101)8 mi
30Denommee Plumbing, HVAC & Electric864.9★ (51)10 mi
31Fuel NRG864.5★ (94)7 mi
32Cool-Rite Mechanical Inc.864.9★ (183)18 mi
33ER Services Plumbing and Heating LLC864.8★ (313)20 mi
34Patriot Heating & Cooling, LLC864.8★ (174)17 mi
35Danerik Mechanical, LLC.865.0★ (45)13 mi
36Druziako HVAC Inc.864.8★ (185)18 mi
37Georges Heating and Cooling864.3★ (82)6 mi
38MVP Home Services854.7★ (545)23 mi
39YurTek - Heating and Cooling855.0★ (86)18 mi
40Hunter & Sons AC & Cooling854.9★ (94)17 mi
41W L Brady Corporation854.8★ (24)8 mi
42Excel Mechanical854.8★ (444)25 mi
43R.H. Young Cooling and Heating, Inc.854.8★ (265)23 mi
44DMI855.0★ (10)6 mi
45American Air HVAC854.8★ (223)22 mi
46Cal's Air Conditioning & Heating845.0★ (18)12 mi
47Colonial Plumbing & Heating844.7★ (32)12 mi
48Pilot Plumbing, Heating and Cooling | Plumber, Tankless Water Heater Repair & Installation | Heating & AC Repair Sandown, NH845.0★ (51)18 mi
49Supreme HVAC Manchester845.0★ (27)9 mi
50Complete Home Services844.8★ (20)11 mi

How we ranked emergency HVAC contractors in Merrimack

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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
Reputation25%Bayesian-adjusted Google star rating
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2
Review volume10%log10(reviews + 1) against the list maximum
Recency10%Share of reviews from the last 12 months
Availability20%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radius
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)

Emergency HVAC contractors in Merrimack: questions

Which HVAC contractors in Merrimack are open 24/7?

25 on this list post 24/7 hours, including Heritage Home Service, High Ground Service Pros - Plumbers Electricians & HVAC Technicians, Sanford Temperature Control, Walley's Heating & Air and A.J. LeBlanc Heating, A/C, Plumbing & Electrical.

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

Heritage Home Service is #1, with a CR Score of 94 out of 100 on emergency weights.

How are emergency HVAC contractors in Merrimack ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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 Merrimack

  1. October 2026: CR Scores recalculated for 526 hvac contractors serving Merrimack.
  2. October 2026: 5 duplicate listings merged.

More emergency and heating and cooling pages