AC Installation in Derry
Get fast, fair pricing from licensed local pros. Typical Derry cost: $3.6k – $7.2k+ installed.
- Central AC (replace)
- $3.6k – $7.2k+
- New central AC + ducts
- $5.4k – $11.5k+
- Ductless mini-split
- $2.7k – $7.2k
- Permit & inspection
- $70 – $350
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AC installation cost by system.
Installed pricing for Derry, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
For homeowners in Derry, New Hampshire, installing a new air conditioning system typically costs between $3,600 and $7,200 for a like-for-like central AC replacement, while a new central AC with ductwork runs $5,400 to $11,700+. Ductless mini-splits range from $2,700 to $7,200, and heat pumps from $4,500 to $10,800+. Given Derry's cold climate and median home age of 45 years, proper sizing and equipment selection are critical. A dual-fuel system—pairing a heat pump with a furnace—is often recommended for efficient heating and cooling. All installations require a mechanical permit from the state, and equipment must meet SEER2 minimums (13.4 SEER2 for the North region). Newer refrigerants like R-32 or R-454B are now mandatory, as R-410A has been phased down. Federal tax credits (25C) can offset up to $2,000 for qualifying heat pumps or $600 for high-efficiency central AC.
- Central AC, like-for-likeExisting ducts in good shape$3,600 – $7,200+
- New central AC + ductworkFirst-time or full duct replacement$5,400 – $11,500+
- Ductless mini-splitSingle or multi-zone, no ducts$2,700 – $7,200
- Heat pump (cooling + heating)Qualifies for federal & local rebates$4,500 – $11,000+
- Permit & inspectionRequired in most jurisdictions$70 – $350
* 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 Derry
U.S. Census ACS- Households
- 9,211
- Homeowners
- 5,384
- 55% own
- Median home value
- $328,200
- Median income
- $83,750
- Median home built
- 1981
- Housing units
- 9,784
With a median home built in 1981, many Derry 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 Derry.
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 Derry
Given New Hampshire’s cold climate and mixed heating, dual-fuel (cold-climate heat pump + gas furnace) is the sensible default for most Derry 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 Derry code requires
Installing or replacing an HVAC system in Derry 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 Derry 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 Derry
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 Installation in Derry, explained.
What Affects AC Installation Costs in Derry
Prices vary based on system type, efficiency, and existing ductwork. A like-for-like central AC replacement is more affordable than adding new ducts. Ductless mini-splits avoid ductwork but cost more per zone. Heat pumps, especially cold-climate models eligible for NHSaves rebates, have higher upfront costs but lower operating costs. Older homes may require electrical upgrades or duct modifications. Labor rates reflect local market conditions, and permit fees add a small amount. Choosing a dual-fuel system can increase initial cost but improve efficiency.
Common AC Installation Issues in Derry
Older Ductwork
Homes built around 1981 may have undersized or leaky ducts, requiring repairs or replacement for proper airflow.
Cold-Climate Sizing
Oversizing or undersizing a system for Derry's cold winters can lead to poor efficiency and comfort; load calculations are essential.
Refrigerant Transition
New installations must use R-32 or R-454B refrigerant, as R-410A is no longer allowed; older systems may need disposal.
AC Installation FAQs — Derry
Yes, New Hampshire requires a mechanical permit for AC installation. Your contractor should handle the permit and inspection process.
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