2027 New Hampshire HVAC Replacement Cost Guide: Install and Running Costs
Adjust your home size & electric cost in New Hampshire
Start with the house: 1,930 sq. ft. is the NH norm, and at that size the load math points to a 3-ton system, about 36,000 BTU. Installed with labor and parts, a 14 SEER system costs $7,990 to $9,630 in NH. That is the efficiency level where purchase price and power bills balance out best in this state.
Run time drives the bill. With cool summers (80.6°F average highs, Zone 1), a NH system works about 9.3 hours a day for about 103 days – 2,443 kWh a season at 16 SEER, or about $930.
Figures assume one ducted central system. Ductless mini-splits are priced on their own, and homes that need more than five tons usually get two smaller units.
New Hampshire Central Air Prices by SEER Rating
The table prices a complete 3-ton replacement in New Hampshire – equipment, labor and hookup – next to the electricity each rating uses in a NH summer.
| 3-ton system | Installed | Equipment | Power / season | Cooling / yr |
|---|---|---|---|---|
| 14 SEER | $7,990 – $9,630 | $5,030 | 2,751 kWh | $1,050 |
| 16 SEER | $10,150 – $12,230 | $6,310 | 2,443 kWh | $930 |
| 18 SEER | $15,450 – $18,630 | $9,480 | 2,203 kWh | $840 |
| 20 SEER | $21,430 – $25,830 | $13,040 | 2,012 kWh | $770 |
A 14 SEER single-stage unit is the budget line at $7,990 to $9,630; about $5,030 of that is equipment. Moving to 16 SEER, often a two-stage compressor, costs $10,150 to $12,230 and cuts seasonal use from 2,751 to 2,443 kWh. If the furnace is old too, run the heat pump calculator before you decide.
New Hampshire AC Prices, City by City
Labor rates differ across New Hampshire. Here is the 16 SEER install priced city by city – each name opens that city's own guide:
16 SEER central AC, installed
- Manchesterpop. 116,000$10,290 – $12,400
- Nashuapop. 92,000$10,260 – $12,360
- Concordpop. 44,000$10,250 – $12,360
- Derrypop. 34,000$10,220 – $12,310
City figures adjust the statewide range for population and metro area, never by more than ±6%.
Does a Higher SEER Pay Off in New Hampshire?
At $0.380/kWh, New Hampshire power is 75% above the $0.217 U.S. average. The rate here has grown about 6.51% a year, so the chart compounds that same rise for each rating, year by year.
Each line is one SEER rating; touch or hover a year to read its dollar figures. The climb is the 6.51% yearly increase NH rates showed over ten years.
2026 = this season at NH's current rate. Each later year compounds the historic 6.51%/yr rise; costs rounded up to $10.
The space between the top and bottom lines is money an old unit burns every summer. Summed over ten seasons, it comes to about $8,060 between 9 and 14 SEER in NH.
Upgrade Payback Finder: Your Old AC vs a New One
Set the two menus: the system in your house now and the one you are weighing. The math uses a 3-ton unit at New Hampshire electric rates, $0.380/kWh and climbing 6.51% yearly.
| Installed price of the new system | $8,690 |
| Electricity saved, first year | $600 |
| Saved over 10 summers (rates rising) | $8,060 |
| Payback | 10.6 years |
| Net after 10 summers | -$630 |
Savings alone fall short: 9 to 14 SEER is still $630 behind after 10 summers in NH.
Replacing a working unit: the whole install counts as the cost. Buying new anyway? See the 14 SEER comparison table further down.
NH Upgrade Payback From a 9 SEER System
| 9 SEER | 14 SEER | 16 SEER | 18 SEER | 20 SEER | |
|---|---|---|---|---|---|
| Installation Cost | - | $8,690 | $11,030 | $16,800 | $23,290 |
| Electric Usage / Yr | 4,320 kWh | 2,751 kWh | 2,443 kWh | 2,203 kWh | 2,012 kWh |
| Electric Cost / Yr | $1,650 | $1,050 | $930 | $840 | $770 |
| Energy Savings / Yr | - | $600 | $720 | $810 | $880 |
| Payback (Rates Rising) | - | 10.6 years | 11.0 years | 13.6 years | 15.9 years |
| 10-Year Net (Rates Rising) | - | -$630 | -$1,390 | -$5,930 | -$11,450 |
Payback counts the 6.51% yearly rate rise; the green column is the best ten-year value.
In New Hampshire the numbers favor 14 SEER: above it, the extra efficiency does not earn back its price within ten years.
Choosing 18 SEER over 14 adds $8,120 here and takes about 20.0 years to come back, even with 6.51% yearly rate increases.
Buy Price vs Ten Years of Power in New Hampshire
Buy Price vs 10-Year Running Cost: Total Cost of Ownership in NH
For each SEER rating: the installed price, 10 years of cooling electricity at New Hampshire rates (rising 6.51% a year), and the two added together. The shortest total bar is the cheapest system to own. Hover or tap a bar for the math.
After 10 years, 14 SEER is the cheapest system to own in New Hampshire: $22,800 all-in ($8,690 installed + $14,120 of electricity).
Energy inflation is built in: season one is priced at today's NH rate, and each of the nine seasons after it costs 6.51% more than the one before, the historic yearly increase. The install figure is the typical installed price on this page. Parts and totals are each rounded up to $10, so the parts may sum $10 above the total.
Monthly math for New Hampshire: 2.87 kW × 9.3 h/day × 30 days ≈ 801 kWh. At $0.380 per kWh, that is roughly $310 a month.
High-Efficiency Systems: 18 and 20+ SEER
An 18 SEER system costs $15,450 to $18,630 installed in NH. It trims the season to about 2,203 kWh and runs longer at low speed, which also evens out room temperatures.
Around Manchester, budget roughly $15,670 to $18,890 for 18 SEER – the metro premium applies at every rating.
For 20+ SEER, plan on $21,430 to $25,830 at NH prices. A Lennox XP20 can reach $31,440; the SL25XPV starts around $41,460.
Tip: Armstrong Air belongs to the same parent company as Lennox and is often quoted lower for comparable equipment. Ask for both prices.
Compared on electricity alone, 20 SEER wins: 2,012 kWh a season, a 27% cut from 14 SEER and 53% from 9 SEER. Here the extra cost outruns the saving over ten years, so it is a comfort choice, not a money choice.
New Hampshire Weather and What It Means for Your System
Beyond size (an average-size unit for a Zone 1 home), New Hampshire's climate affects which equipment and options are worth paying for.
Climate zones run from 1 (cool) to 5 (hot); New Hampshire is in Zone 1.
Short summers. With a cooling season of about 103 days, high-SEER equipment saves less here than in hot states. Spend on the right size and a good installation first.
Cold winters. In New Hampshire the heating side often decides the system. A cold-climate heat pump can do both jobs; another route is dual fuel, which pairs a heat pump with a natural gas furnace for the coldest days.
Snow and ice. In winter, a cooling-only condenser needs nothing more than a top cover. A heat pump runs all winter, so it must stay raised and clear.
When to buy: early spring, before the first heat wave fills NH installers' calendars.
Price a Central AC for Your ZIP Code
Reading a SEER Rating
Think of SEER as miles per gallon for cooling: BTUs of heat removed per watt-hour of power, averaged over a season.
For the 36,000 BTU system this page prices, 14 SEER works out to 2,571 W of compressor draw (36,000 ÷ 14). The fan adds about 300 W, for roughly 2.87 kW in total.
Shopping tip: equipment rated under the newer rules carries a SEER2 number, which reads lower than old-style SEER for the same unit.
Typical tonnage by home size and climate zone. Find the Zone 1 column for NH:
| AC Size | ZONE 1 | ZONE 2 | ZONE 3 | ZONE 4 | ZONE 5 |
|---|---|---|---|---|---|
| 1.5 Ton | 700-1100 s.f. | 700-1050 s.f. | 500-1000 s.f. | 500-950 s.f. | 500-900 s.f. |
| 2 Ton | 1101-1400 s.f. | 1051-1350 s.f. | 1001-1300 s.f. | 951-1250 s.f. | 901-1200 s.f. |
| 2.5 Ton | 1401-1650 s.f. | 1351-1500 s.f. | 1301-1500 s.f. | 1251-1550 s.f. | 1201-1500 s.f. |
| 3 Ton | 1651-2100 s.f. | 1601-2000 s.f. | 1601-1900 s.f. | 1501-1850 s.f. | 1501-1800 s.f. |
| 3.5 Ton | 2101-2300 s.f. | 2001-2250 s.f. | 1901-2200 s.f. | 1851-2150 s.f. | 1801-2100 s.f. |
| 4 Ton | 2301-2700 s.f. | 2251-2700 s.f. | 2201-2500 s.f. | 2151-2500 s.f. | 2101-2400 s.f. |
| 5 Ton | 2701-3300 s.f. | 2751-3300 s.f. | 2601-3200 s.f. | 2501-3100 s.f. | 2401-3000 s.f. |
Treat these as ballpark sizes. Insulation, windows and shade change the answer, which is why installers run a Manual J.
Slide to Your Square Footage
Ballpark Your New Hampshire AC Cost
Slide to your home size - the range is recomputed by the same model as this page, at statewide rates.
$7,990 – $9,630 14 SEER central AC, installed
New Hampshire AC Questions
How much does a new central AC cost in New Hampshire?
Most NH homes need a 3-ton system: $7,990 to $9,630 at 14 SEER, $10,150 to $12,230 at 16 SEER, and $15,450 to $18,630 at 18 SEER, labor included.
Is a high-SEER air conditioner worth it in New Hampshire?
Counting price plus ten years of power at rising rates, 14 SEER wins in NH at $22,800. The next best, 16 SEER, totals $23,570.
What is the monthly cooling cost in NH?
A 14 SEER, 3-ton system uses about 2,751 kWh a season here, roughly $1,050 a year or $310 in a peak month.
* Planning figures. Have the contractor run a Manual J load calculation and check the ducts before ordering. Prices, rates and savings move with the market.
