11 HVAC Service Contractors in Londonderry, NH
Top-Rated HVAC Service Contractors in Londonderry
Southern New Hampshire Plumbing and Heating
“256 five-star reviewers praise the company's same-day emergency response and transparent upfront pricing. Customers specifically mention technicians Chuck and…”
Rob Roy Mechanical
“Every reviewer awarded a perfect 5-star rating, with customers particularly praising pricing transparency, pre-work estimate details, and technician…”
All HVAC Service Contractors (11 total)
Tom's Mechanical Services llc
“Eight of twelve reviewers specifically praise the same-day or emergency response capability, with three…”
Metal Works Inc
“One of five reviewers awarded 2 stars citing contract term disputes and payment deadline conflicts, while the…”
HVAC Service Costs in Londonderry
General HVAC service pricing across maintenance, repair, and installation in Londonderry.
| Service | Low | Average | High |
|---|---|---|---|
Service call / diagnostic | $81 | $130 | $216 |
Routine tune-up (single system) | $76 | $135 | $216 |
Standard repair (avg) | $162 | $648 | $1,296 |
Major repair (compressor, heat exchanger) | $1,620 | $2,700 | $3,780 |
New system installation (mid-range) | $7,020 | $11,340 | $15,120 |
Full HVAC replacement AC + furnace combined | $12,517 | $14,504 | $15,228 |
Prices reflect continental metro averages compiled from published industry cost guides, contractor surveys, and regional labor data. Last updated: April 2026.
HVAC Service in Londonderry, NH: What to Expect
Southern New Hampshire's climate shapes every homeowner's relationship with their heating and cooling systems. Winters drop to 20 F with steady snowfall, while summers climb into the mid-80s with humidity that makes indoor air feel thick and stale. The October-through-April heating season runs nearly seven months, making reliable warmth a necessity rather than a luxury. When summer humidity arrives, cooling systems work overtime to restore comfort indoors. With 38 HVAC professionals serving Londonderry and surrounding communities, the area maintains an average rating of 3.8 across more than 4,300 client reviews, a respectable benchmark for a region where temperature extremes define seasonal living.
Service pricing in the Londonderry area reflects the technical demands of each job. A standard diagnostic visit typically costs between $81 and $216, while annual furnace or air conditioning tune-ups range from $76 to $216 depending on system complexity. Standard repairs average $162 to $1,296, with final costs reflecting parts, labor, and whether systems require permit-related work. New Hampshire requires HVAC contractors to hold either a Class A (unlimited), Class B (residential), or Class C (limited/service) license through the state Office of Professional Licensure and Certification, so verifying credentials before work begins protects homeowners.
Three businesses consistently earn enthusiastic recommendations from local clients. Southern New Hampshire Plumbing and Heating holds a 4.9 rating from 256 five-star reviews, with clients praising same-day emergency response and upfront pricing, technicians Chuck and Justin receive specific mention for their thoughtful approach. Rob Roy Mechanical also carries a 4.9 average, with every reviewer awarding a perfect 5 stars for pricing transparency and detailed estimates provided before work starts. Technicians communicate arrival times proactively, which clients value highly. Nelson Electric & Air achieves a 5.0 rating across 95 reviews, with customers repeatedly noting transparent communication, tidy work sites left behind, and fair pricing from technicians named Mike or Michael.