❄️ Official Rankings
10 Best HVAC in Londonderry, NH (August 2026)
We compared 10 hvac serving Londonderry and Rockingham County, New Hampshire, and ranked the top providers by verified reviews, ratings, and local reputation — 3,047 customer reviews in all.
The 10 listed below hold an average rating of 4.9 out of 5, led by Mainline Plumbing. Updated for August 2026.
- HVAC ranked
- 10
- Average rating
- 4.9★
- Reviews analyzed
- 3,047
- Area code
- 603
Mainline Plumbing
⭐ 5.0 · 646 reviews
71 Mammoth Rd, Londonderry, NH 03053
Nelson Electric & Air
⭐ 5.0 · 99 reviews
127 West Rd, Londonderry, NH 03053
Southern New Hampshire Plumbing and Heating
⭐ 4.9 · 458 reviews
39 Rockingham Rd, Londonderry, NH 03053
Rob Roy Mechanical
⭐ 4.9 · 259 reviews
86 Nashua Rd #1279, Londonderry, NH 03053
Daigle Plumbing, Heating & Cooling
⭐ 4.8 · 1003 reviews
11 Windham Rd, Derry, NH 03038
Derry Plumbing & Heating
⭐ 4.8 · 235 reviews
71 Birch St Ste A, Derry, NH 03038
603 Chimney & Dryer Vent
⭐ 4.9 · 55 reviews
1B Commons Dr, Londonderry, NH 03053
HVAC listed here serve Londonderry, Rockingham County, and nearby ZIP codes including 03053.