7 HVAC Repair Contractors in Londonderry, NH
Top-Rated HVAC Repair Contractors in Londonderry
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 Repair Contractors (7 total)
HVAC Repair Costs in Londonderry
Typical heating and cooling repair costs in Londonderry, by component.
| Service | Low | Average | High |
|---|---|---|---|
Diagnostic / service call | $83 | $132 | $220 |
Thermostat replacement | $165 | $303 | $550 |
Blower motor replacement | $440 | $715 | $1,210 |
Heat exchanger replacement | $1,650 | $2,420 | $3,850 |
Ignitor replacement (gas furnace) | $165 | $275 | $440 |
Control board replacement | $330 | $605 | $990 |
Full system repair (major) Multi-component failure | $550 | $1,320 | $3,300 |
Prices reflect continental metro averages compiled from published industry cost guides, contractor surveys, and regional labor data. Last updated: April 2026.
HVAC Repair in Londonderry, NH: What to Expect
Southern New Hampshire delivers heating season demands from October through April with temperatures dipping into the twenties, while humid summers push thermostats into the eighties. This climate swing creates year-round reliance on heating and cooling systems, making reliable HVAC Repair in Londonderry essential for homeowners. Seven contractors serve this Derry market, though the average rating sits at 1.7 across roughly 273 customer reviews, suggesting quality consistency remains a challenge.
Homeowners should expect to pay between $83 and $220 for a diagnostic service call, with thermostat replacements ranging from $165 to $550 and blower motor work climbing to $440 to $1210 depending on system complexity. New Hampshire requires HVAC contractors to hold either a Class A (unlimited), Class B (residential), or Class C (service) license from the state Office of Professional Licensure and Certification before pulling permits for new installations or significant upgrades.
Customer feedback reveals significant service differences among local specialists. Rob Roy Mechanical maintains a perfect five star rating with clients praising transparent pricing and clear communication about project timelines. Tom's Mechanical Services llc stands out for rapid response, with eight of twelve reviewers highlighting same-day or emergency capability, including documented after-hours assistance. These contrasting approaches suggest trade-offs between comprehensive planning and urgent responsiveness warrant careful consideration.