HVAC Replacement Cost in Nashua, NH (2026)
Updated October 2026 · Nashua, NH · index 0.99
How much does a new HVAC system cost in Nashua? For a 3-ton system with central AC + gas furnace, homeowners in Nashua, NH pay about $10,400 on average, and most quotes land between $7,100 and $13,700 — $2,365 to $4,567 per ton. The price covers removing the old system, the new outdoor and indoor equipment, a new line set, electrical and condensate connections, the thermostat, the permit, start-up and commissioning.
The HVAC replacement price in Nashua runs 1% below the U.S. average: construction labor in the Nashua area runs 2% below the national mean, materials 1% above. The same job averages $10,500 nationally and about $10,400 at the New Hampshire statewide index.
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HVAC replacement price in Nashua by system type
What a 3-ton system costs in Nashua with each system type, installed:
| Option | Average · range |
|---|---|
| Central AC + gas furnacesplit AC, matched coil and an 80,000 BTU furnace$3,466 per ton | $10,400$7,100 – $13,700 |
| Heat pump + air handlerall-electric split heat pump, no furnace$3,215 per ton | $9,650$6,500 – $12,800 |
| Cold-climate heat pump + air handlervariable-speed heat pump rated for deep winter$3,673 per ton | $11,000$7,450 – $14,600 |
The least expensive option in Nashua is heat pump + air handler, at about $9,650; cold-climate heat pump + air handler averages $11,000, 1.1 times as much.
Cost to replace an HVAC system in Nashua by size
With central AC + gas furnace, priced for Nashua, NH:
| Size | Average · range |
|---|---|
| A 2-ton system$4,512 per ton | $9,000$6,150 – $11,900 |
| A 3-ton system$3,466 per ton | $10,400$7,100 – $13,700 |
| A 4-ton system$2,943 per ton | $11,800$8,050 – $15,500 |
Some costs stay the same whatever the size — load calculation and equipment sizing, mechanical permit and inspection, old system removed, refrigerant recovered — so a bigger job costs less per unit: $2,943 per ton for a 4-ton system against $4,512 for a 2-ton system.
What an HVAC replacement in Nashua includes
Line by line, the $10,400 average for a 3-ton system breaks down like this: 32% labor, 65% materials and equipment, and $280 in permit fees passed through at cost.
| Line | Low – high |
|---|---|
| Load calculation and equipment sizing | $80 – $230 |
| Mechanical permit and inspection | $150 – $400 |
| Old system removed, refrigerant recovered | $340 – $600 |
| Gas furnace (about 80,000 BTU) | $1,500 – $2,700 |
| Outdoor unit, set on a new pad | $2,250 – $4,200 |
| Matched indoor coil | $980 – $2,100 |
| New refrigerant line set (25 ft) | $380 – $600 |
| Disconnect, whip and thermostat wire | $210 – $340 |
| Condensate drain and safety switch | $110 – $260 |
| Gas connection and furnace venting | $320 – $590 |
| Plenums and transitions to the ducts | $260 – $600 |
| Programmable or smart thermostat | $230 – $410 |
| Evacuation and refrigerant charge | $110 – $230 |
| Start-up and commissioning | $110 – $260 |
| Warranty registration and walk-through | $60 – $130 |
Each line is the price book's U.S. rate for that step, scaled by 0.76 to the installed price published sources give for the whole job (see how these prices are built), times Nashua's index of 0.99; permit fees are not scaled.
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What affects HVAC replacement prices in Nashua
Labor and materials in Nashua
Construction wages in the Nashua area run 2% below the U.S. mean (BLS, May 2025), and materials in its ZIP codes price 1% above the national average. Together they give Nashua a construction cost index of 0.99.
Where Nashua sits in New Hampshire
Nashua is the 2nd most expensive of the 4 New Hampshire cities in our index, against a statewide index of 0.99. Portsmouth is the dearest at 1.11; Concord is the least expensive at 0.98.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Nashua ranks 169th from the most expensive. The job that averages $10,400 here averages $10,500 at the national rate.
Climate a system is sized for in New Hampshire
Contractors size equipment for the local design temperatures. Across New Hampshire's counties the median is about 88°F on a hot summer day and -4°F on a cold winter night (ENERGY STAR county table), and your county can differ. Winters that cold are where a cold-climate heat pump or a furnace earns its price.
Sales tax in New Hampshire
New Hampshire has no state sales tax. Prices on this page are before any tax.
What a Nashua contractor will ask before quoting
- Job type — new construction, replacement or upgrade — and the evidence for it
- Heating and cooling load for this house (not the old nameplate), tonnage, fuel and refrigerant
- Ducts, line set, circuit, gas line and flue: keep, fix or replace, each with its reason
- Water heater in scope, and whether it shared the old flue
- Panel main amps, free slots and the new equipment's MCA
- Permits, tests and incentives that apply in this state
HVAC replacement cost in other New Hampshire cities
A 3-ton system with central AC + gas furnace averages $10,400 in Nashua; $10,400 in Manchester, $10,300 in Concord, $11,600 in Portsmouth.
| City | Average · range |
|---|---|
| Manchester, NHsame as Nashua | $10,400$7,100 – $13,700 |
| Concord, NH1% less | $10,300$7,050 – $13,600 |
| Portsmouth, NH12% more | $11,600$7,950 – $15,300 |
HVAC replacement price in Nashua: questions
How much does a new HVAC system cost in Nashua, NH?
About $10,400 for a 3-ton system with central AC + gas furnace, and most Nashua quotes fall between $7,100 and $13,700. That is 1% below the U.S. average, where the same job averages $10,500.
What is the HVAC price per ton in Nashua?
$2,365 to $4,567 per ton, about $3,466 on average with central AC + gas furnace. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 4-ton system in Nashua?
$8,050 to $15,500, about $11,800 on average, with central AC + gas furnace — $2,943 per ton.
Do you need a permit for HVAC replacement in Nashua?
Yes — installing HVAC or fuel-burning equipment needs a permit nearly everywhere, Nashua included. The prices on this page carry $150–$400 for the permit and inspection.
Does the price include sales tax in New Hampshire?
No tax is included, and New Hampshire has no state sales tax.
What size HVAC system does a house in Nashua need?
It is worked out with a Manual J load calculation for the house — included in the prices above — not from square footage alone. Here it is run against design temperatures of about 88°F in summer and -4°F in winter (the New Hampshire median).
Other home projects in Nashua
HVAC replacement cost in New Hampshire
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The HVAC replacement is priced step by step, then multiplied by Nashua's construction cost index of 0.99.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: central AC + gas furnace × 0.76 (HomeCostCalcs 2026: $7,000–$14,000); heat pump + air handler × 0.76, following central AC + gas furnace; cold-climate heat pump + air handler × 0.76, following central AC + gas furnace.
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Nashua, each on its own base: HUD 1.08, Craftsman 1.06. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Nashua build quotes like these with JobFlex's HVAC estimator.
- HomeCostCalcs 2026: furnace + AC replacement $7,000-$14,000 standard, $10,000-$20,000 high efficiency
- Today's Homeowner 2025: complete HVAC system install $5,000-$12,500