6 AC Repair Contractors in Londonderry, NH
Top-Rated AC Repair 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…”
AC Repair Costs in Londonderry
Typical repair costs for Londonderry homeowners, by problem type.
| Service | Low | Average | High |
|---|---|---|---|
Diagnostic / service call Usually credited toward repair | $83 | $132 | $220 |
Refrigerant recharge (R-410A) | $165 | $385 | $770 |
Capacitor replacement | $132 | $275 | $495 |
Fan motor replacement | $275 | $495 | $770 |
Compressor replacement | $880 | $1,980 | $3,080 |
Evaporator coil repair | $440 | $990 | $1,650 |
Labor (hourly rate) Per hour during business hours | $83 | $121 | $165 |
Prices reflect continental metro averages compiled from published industry cost guides, contractor surveys, and regional labor data. Last updated: April 2026.
AC Repair in Londonderry, NH: What to Expect
Southern New Hampshire delivers the kind of weather that makes reliable cooling essential. Winters drop to around 20 F with heavy snow, while summers climb into the warmth and humidity zone near 82 F, pushing AC systems hard from June through September. With six contractors serving the Londonderry area and an average rating of 2.1 across 729 reviews, homeowners face real choices about who they trust with AC Repair in Londonderry.
Pricing reflects the specific work required. A diagnostic or service call runs $83-$220, while refrigerant recharge using R-410A costs $165-$770 depending on system size and leak severity. Capacitor replacement, a frequent fix for weak cooling performance, ranges from $132-$495. New Hampshire requires contractors to hold an HVAC/R Contractor License from the Office of Professional Licensure and Certification, meaning technicians must meet state competency standards before handling refrigerants and high-voltage components.
What separates the options comes through in customer feedback. Southern New Hampshire Plumbing and Heating draws 256 five-star reviewers praising same-day emergency response and upfront pricing, with customers specifically mentioning technicians Chuck and Justin by name. Rob Roy Mechanical holds a perfect 5.0 rating from every reviewer, with clients consistently noting pricing transparency and advance communication about arrival times. Tom's Mechanical Services achieves similar recognition, where eight of twelve reviewers highlight same-day or emergency capability and three recount after-hours calls receiving rapid assistance.