How Much Does It Cost to Run Air Conditioning in New Hampshire?
Hourly, monthly and yearly cooling costs at New Hampshire's actual electricity rate, by system size and SEER rating.
By Mark Curant·Updated
Quick answer
At New Hampshire's average residential rate of 26.60¢/kWh (July 2026), a typical 3-ton central air conditioner (SEER 14) costs about $0.68 per hour, $164 for a summer month at 8 hours a day, and roughly $616 a year in a climate with a short cooling season (about 900 cooling hours). New Hampshire's rate is 45% above the U.S. average of 18.31¢/kWh, ranking #8 of 51 for the most expensive residential electricity.
Per hour
$0.68
3-ton, SEER 14
Summer month
$164
8 hrs/day × 30 days
Per year
$616
900 cooling hours
Your numbers in New Hampshire
Your AC now (SEER 10)
$862/yr
$0.96/hr · $230 summer month
New system (SEER 16)
$539/yr
$0.60/hr · $144 summer month
You would save
$323/yr
$3,232 over 10 years
Starts from New Hampshire's average residential rate and typical cooling hours. Want payback on a quote? Open the full calculator with these numbers →
Cost to run AC in New Hampshire by system size
Costs for a SEER 14 central air conditioner at 26.60¢/kWh. Not sure of your size? Most homes need about 1 ton per 500–600 sq ft; our AC sizing calculator gives a closer estimate.
| System size | Per hour | Per day (8 hrs) | Summer month | Per year (900 hrs) |
|---|---|---|---|---|
| 1.5 ton (18,000 Btu) | $0.34 | $2.74 | $82 | $308 |
| 2 ton (24,000 Btu) | $0.46 | $3.65 | $109 | $410 |
| 2.5 ton (30,000 Btu) | $0.57 | $4.56 | $137 | $513 |
| 3 ton (36,000 Btu) | $0.68 | $5.47 | $164 | $616 |
| 3.5 ton (42,000 Btu) | $0.80 | $6.38 | $192 | $718 |
| 4 ton (48,000 Btu) | $0.91 | $7.30 | $219 | $821 |
| 5 ton (60,000 Btu) | $1.14 | $9.12 | $274 | $1,026 |
How much a more efficient AC saves in New Hampshire
Annual cost of a 3-ton system at 900 cooling hours a year. Older systems are often SEER 10 or lower; new systems must be at least 13.4–14.3 SEER2 (about SEER 14–15) depending on region.
| SEER rating | Annual cost | Savings vs. SEER 10 | 10-year savings |
|---|---|---|---|
| SEER 10 | $862 | — | — |
| SEER 13 | $663 | $199 | $1,989 |
| SEER 14 | $616 | $246 | $2,462 |
| SEER 16 | $539 | $323 | $3,232 |
| SEER 18 | $479 | $383 | $3,830 |
| SEER 20 | $431 | $431 | $4,309 |
For your exact system, rate and usage, run the SEER savings calculator with New Hampshire's rate filled in.
Why your bill may differ
The yearly figures assume 900 hours of full-power cooling, our estimate for a climate with a short cooling season. Within New Hampshire, a home in a hotter area, with poor insulation or a lower thermostat setting will run more. Here is the same 3-ton SEER 14 system at other usage levels:
| Usage | Cooling hours / year | Annual cost in New Hampshire | At U.S. average rate |
|---|---|---|---|
| Light | 900 | $616 | $424 |
| Average | 1,500 | $1,026 | $706 |
| Heavy | 2,200 | $1,505 | $1,036 |
| Very heavy | 3,000 | $2,052 | $1,412 |
At typical usage, New Hampshire homeowners pay $192 a year more to run the same system than they would at the U.S. average rate.
Ways to cut your cooling bill
- Raise the thermostat while you're away. See the $0 thermostat strategy.
- Change the filter on schedule; a clogged one can raise cooling costs 5–15%. See the $10 air filter fix.
- If your system is 15+ years old, compare repair and replacement with the repair vs. replace calculator.
- Ask your utility about AC rebates. The federal tax credit ended Dec. 31, 2025; see the 2026 rebate guide.
Nearby on the price list
Frequently asked questions
How much does it cost to run AC per hour in New Hampshire?
About $0.68 an hour for a typical 3-ton central air conditioner rated SEER 14, at New Hampshire's average residential rate of 26.60¢/kWh (July 2026). A 2-ton system costs about $0.46 an hour and a 5-ton about $1.14.
How much does central air cost per month in New Hampshire?
Running 8 hours a day for a 30-day summer month, a 3-ton SEER 14 system uses about 617 kWh, or about $164 at 26.60¢/kWh.
Is a high-efficiency AC worth it in New Hampshire?
Replacing a SEER 10 system with a SEER 16 saves about $323 a year in New Hampshire at typical usage (900 cooling hours). Going from SEER 14 to SEER 18 saves about $137 a year, so the extra cost of a premium system pays back faster where electricity is expensive and the cooling season is long.
How we calculated this
Power draw (kW) = tons × 12,000 Btu/h ÷ SEER ÷ 1,000. Cost = kW × hours × rate. The rate is New Hampshire's average residential price for July 2026 from the U.S. Energy Information Administration (Electric Power Monthly, Table 5.6.A). Average prices include taxes and fees spread across all usage; your marginal rate on your bill may be higher or lower. Cooling hours are our estimate by climate. SEER describes average seasonal efficiency, so real hourly draw is higher on the hottest afternoons and lower on mild days.
Download the data: residential electricity rates by state (CSV).
Run your own numbers
The calculator opens with New Hampshire's rate (26.60¢/kWh) and typical hours filled in. Add your system's SEER and size to see your cost and what an upgrade would save.
Calculate for New HampshireSee all states in the AC running-cost guide.