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How Much to Run a Window AC in Maine? $0.36/Hr, $31/Summer

Running window air conditioner in Maine costs about $0.36 an hour and roughly $31 for the summer — 1,100 W for 1.0 hours a day at 32.41¢/kWh.

$0.36per hour
$31per summer, 92 days
255cooling degree-days, NOAA

· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

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Window air conditioner in Maine: watts ÷ 1,000 × hours × days × rate. Estimate, not a quote.
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Per hour
$0.36 at 32.41¢/kWh
Per summer
$31 (92 days)
Hours per day
1.0 (NOAA state cooling degree-days-scaled)
Degree-days used
255 (NOAA CPC state, population-weighted)
Wattage
1,100 W (typical 500–1,500)
Maine rate
32.41¢ (July 2026)
Rank of 20 cold states
14 (14th most expensive)

Why this number

Running window air conditioner in Maine costs about $0.36 an hour and roughly $31 for the summer — a 1,100 W unit for 1.0 hours a day over 92 days (June–August) at Maine’s July 2026 average of 32.41¢/kWh. The hours are the national 3.6 h/day baseline scaled by NOAA CPC state population-weighted CDD, June–August 2026 (255 vs the CONUS 958); your utility’s rate moves it (table below), and the calculator takes your own wattage, hours and rate.

Maine runs window air conditioner less than the national baseline in June–August — 1.0 hours a day on the NOAA state degree-day scaling used here, against 3.6 nationally — and pays 32.41¢/kWh for it. Those two numbers, times 1,100 W, are the whole $31.

Window air conditioner cost in Maine by hours per day — per day / per summer

Window air conditioner cost per day and per summer in Maine at 1 to 12 hours a day, at the state average rate and its largest utilities' EIA-861 prices
Hours per day Maine avg 32.41¢ Central Maine Power Co 22.4¢ Versant Power 27.5¢ Electricity Maine, LLC 16.8¢
1 h $0.36 / $33 $0.25 / $23 $0.30 / $28 $0.18 / $17
2 h $0.71 / $66 $0.49 / $45 $0.61 / $56 $0.37 / $34
4 h $1.43 / $131 $0.99 / $91 $1.21 / $111 $0.74 / $68
6 h $2.14 / $197 $1.48 / $136 $1.82 / $167 $1.11 / $102
8 h $2.85 / $262 $1.97 / $181 $2.42 / $223 $1.48 / $136
12 h $4.28 / $394 $2.96 / $272 $3.63 / $334 $2.22 / $204

What Maine’s utilities charge for it

Maine's largest electric utilities and what window air conditioner costs per hour and per summer at each one's average price
Utility Residential customers ¢/kWh (EIA-861 2024) Per hour Per summer at 1.0 h/day
Central Maine Power Co 577,955 22.4¢ $0.25 $22
Versant Power 137,906 27.5¢ $0.30 $27
Electricity Maine, LLC 17,749 16.8¢ $0.18 $16

What the numbers say about window air conditioner in Maine

Maine logged 255 population-weighted cooling degree-days over June–August (NOAA CPC state series), 27% of the CONUS figure of 958, which is why this page runs window air conditioner 1.0 hours a day against the national 3.6 — 2.6 hours less. At Maine’s July 2026 rate of 32.41¢/kWh that makes it the 14th most expensive of the 20 cold states for window air conditioner: $31 for the 92-day summer, against Montana’s $14 and Alaska’s $68. Central Maine Power Co, Maine’s largest utility with 577,955 residential customers, averages 22.4¢ — $22 for the same hours — while Electricity Maine, LLC at 16.8¢ comes to $16, a $5 spread on identical use. Maine’s July 2026 rate of 32.41¢ sets the $0.36 per hour; its winter average of 29.81¢ is 2.60¢ lower, a difference that matters for heating loads but not for window air conditioner use in June–August.

Frequently asked questions

How much does it cost to run window air conditioner per hour in Maine?

$0.36 an hour for a 1,100 W unit at Maine’s July 2026 average of 32.41¢/kWh (1,100 ÷ 1,000 × 0.3241); at Central Maine Power Co’s 22.4¢ it is $0.25.

How much does window air conditioner cost for the whole summer in Maine?

About $31: 1,100 W × 1.0 hours a day × 92 days (June–August) × 32.41¢. The hours are the national 3.6 h/day scaled by NOAA CPC state population-weighted CDD, June–August 2026 (255 against the CONUS 958); enter your own hours above for your own figure.

Is window air conditioner expensive to run in Maine compared with other cold states?

Maine is the 14th most expensive of the 20 cold states on this site at $31 a summer; the range runs from Montana ($14) to Alaska ($68), driven almost entirely by the electricity rate.

How we calculated this

Worked for window air conditioner in Maine: 1,100 W ÷ 1,000 × 0.3241 $/kWh = $0.36 per hour; hours per day = 3.6 × (255 ÷ 958) = 1.0; 1,100 ÷ 1,000 × 1.0 × 92 × 0.3241 = $31 for the summer. Rate: EIA Electric Power Monthly 5.6.A (July 2026); degree-days: NOAA CPC state population-weighted CDD, June–August 2026, against the CONUS total; utility prices: EIA-861 2024.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

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