AC Installation in Londonderry
Get fast, fair pricing from licensed local pros. Typical Londonderry cost: $3.7k – $7.5k+ installed.
- Central AC (replace)
- $3.7k – $7.5k+
- New central AC + ducts
- $5.6k – $12k+
- Ductless mini-split
- $2.8k – $7.5k
- Permit & inspection
- $70 – $375
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AC installation cost by system.
Installed pricing for Londonderry, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
AC installation costs in Londonderry, NH, typically range from $3,700 to $7,500 for a like-for-like central AC replacement, and $5,600 to $12,200+ if new ductwork is needed. Ductless mini-splits run $2,800–$7,500, while heat pumps (including cold-climate models) cost $4,700–$11,200+. With 80% homeownership and a median home age of 43 years, many homes need system upgrades. New Hampshire requires a mechanical permit for AC installation, and since R-410A is phased out, equipment must use R-32 or R-454B refrigerant. The federal 25C tax credit offers up to $2,000 for qualifying heat pumps and up to $600 for high-efficiency central AC.
- Central AC, like-for-likeExisting ducts in good shape$3,700 – $7,500+
- New central AC + ductworkFirst-time or full duct replacement$5,600 – $12,000+
- Ductless mini-splitSingle or multi-zone, no ducts$2,800 – $7,500
- Heat pump (cooling + heating)Qualifies for federal & local rebates$4,700 – $11,000+
- Permit & inspectionRequired in most jurisdictions$70 – $375
* High-efficiency systems cost more upfront but may qualify for federal tax credits and utility rebates.
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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AC Installation in Londonderry, explained.
What affects AC installation cost in Londonderry?
System type is the main driver: a ductless mini-split is generally more affordable than a central AC with new ductwork. Cold-climate heat pumps (NEEP-listed) cost more but qualify for NHSaves rebates and handle Londonderry's low ambient temperatures. Home age matters—older homes may need duct modifications or load calculations. Permit fees and labor rates in this tier-4 market also influence the final price.
Common AC installation issues in Londonderry
Older ductwork
Homes built around 1983 often have undersized or leaky ducts that need replacement or sealing, adding cost.
Refrigerant transition
R-410A is no longer allowed; installers must use R-32 or R-454B, which may require different equipment and handling.
Cold-climate sizing
Londonderry's cold winters mean heat pumps must be rated for low ambient temperatures, or a dual-fuel system may be recommended.
AC Installation FAQs — Londonderry
Yes, New Hampshire requires a mechanical permit for AC installation. Your contractor should pull the permit and schedule inspections.
AC Installation near Londonderry
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