AC Repair in Londonderry
Get fast, fair pricing from licensed local pros. Typical Londonderry cost: $150 – $375 installed.
- Capacitor / contactor
- $150 – $375
- Refrigerant recharge
- $225 – $700
- Fan / blower motor
- $325 – $850
- Compressor
- $1.1k – $2.6k+
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AC repair cost by part.
Typical Londonderry repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
AC repair costs in Londonderry, New Hampshire, typically range from $150–$375 for a capacitor or contactor replacement to $1,100–$2,600+ for a compressor, plus a $70–$175 diagnostic fee. With 80.3% homeownership and a median home built in 1983, many systems are aging and may need repairs or upgrades. New Hampshire requires a mechanical permit for AC work, and since 2025, new equipment must use R-32 or R-454B refrigerant (R-410A phased down). Cold-climate sizing is important; NHSaves rebates require cold-climate heat pumps rated for low ambient temperatures. For central AC, the federal 25C tax credit offers up to $600 for high-efficiency units. Dual-fuel systems are recommended for efficient heating and cooling in Londonderry's mixed climate.
- Diagnostic / service callOften credited toward the repair$70 – $175
- Capacitor or contactorMost common no-cooling cause$150 – $375
- Refrigerant rechargeLeak search adds to the cost$225 – $700+
- Fan or blower motorCondenser or air-handler motor$325 – $850
- Compressor replacementOften near replace-the-system territory$1,100 – $2,600+
* If the system is over ~12 years old or the compressor fails, weigh repair against replacement.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in Londonderry
U.S. Census ACS- Households
- 4,857
- Homeowners
- 3,734
- 80% own
- Median home value
- $392,000
- Median income
- $113,557
- Median home built
- 1983
- Housing units
- 4,649
With a median home built in 1983, many Londonderry AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about Londonderry.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for Londonderry
Given New Hampshire’s cold climate and mixed heating, dual-fuel (cold-climate heat pump + gas furnace) is the sensible default for most Londonderry homes. The cooling season is short, so the budget is better spent on heating efficiency than on ultra-high SEER2. A pro can confirm the right size and system for your home with a load calculation.
Sources: NHSaves Heat Pumps (residential rebates) · NH Department of Energy Home Electrification & Appliance Rebates · Choose Energy NH electricity rates
What Londonderry code requires
Installing or replacing an HVAC system in Londonderry follows New Hampshire rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum13.4 SEER2 (North)
Federal North-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRecommended
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
Cold-climate sizing matters: NHSaves rebates require cold-climate heat pumps rated for low ambient (NEEP-listed) performance, and equipment must use R-32/R-454B (R-410A no longer allowed).
Sources: NHSaves Heat Pumps (residential rebates) · NH Department of Energy Home Electrification & Appliance Rebates · Choose Energy NH electricity rates
Not sure which rules and rebates apply to your home?
A licensed Londonderry pro will walk you through code, the right unit, and what you can claim back — in one quick call.
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Money back in Londonderry
New Hampshire heating is mostly mixed, which shapes the money back:
- State$250 per ton, up to $1,250NHSaves Cold-Climate Heat Pump Rebate (standard tier, switching from oil/gas/propane) →
State or utility program — verify eligibility before you buy.
- State$750 (UEF 2.0+)NHSaves Heat Pump Water Heater Rebate →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
- Federal30% of cost, up to $600Federal 25C tax credit — central AC →
For a qualifying high-efficiency central air conditioner.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state, including New Hampshire.
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- 1
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- 2
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- 3
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AC Repair in Londonderry, explained.
What Affects AC Repair Costs in Londonderry
Prices vary by the part needed—capacitors are more affordable than compressors—and by labor time. Older homes (median built 1983) may have outdated ductwork or electrical systems requiring extra work. Permit fees add to the cost. Seasonal demand can affect availability, and cold-climate sizing may require specialized components for efficient operation.
Common AC Repair Issues in Londonderry
Capacitor or Contactor Failure
These parts often fail in older systems, causing the AC to not start or run intermittently. Repair cost: $150–$375.
Refrigerant Leak or Low Charge
Leaks reduce cooling efficiency and may require a recharge ($225–$700+) and leak repair. Newer systems use R-32 or R-454B refrigerant.
Fan or Blower Motor Problems
A failing motor can reduce airflow and freeze coils. Replacement runs $325–$850, depending on motor type and accessibility.
AC Repair FAQs — Londonderry
Yes, New Hampshire requires a mechanical permit for most AC repairs involving refrigerant or electrical work. Your contractor should handle the permit and inspection.
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