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How Much to Run a Window AC in Idaho? $0.15/Hr, $26/Summer

Running window air conditioner in Idaho costs about $0.15 an hour and roughly $26 for the summer — 1,100 W for 1.9 hours a day at 13.73¢/kWh.

$0.15per hour
$26per summer, 92 days
504cooling 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 Idaho: watts ÷ 1,000 × hours × days × rate. Estimate, not a quote.
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Per hour
$0.15 at 13.73¢/kWh
Per summer
$26 (92 days)
Hours per day
1.9 (NOAA state cooling degree-days-scaled)
Degree-days used
504 (NOAA CPC state, population-weighted)
Wattage
1,100 W (typical 500–1,500)
Idaho rate
13.73¢ (July 2026)
Rank of 20 cold states
16 (16th most expensive)

Why this number

Running window air conditioner in Idaho costs about $0.15 an hour and roughly $26 for the summer — a 1,100 W unit for 1.9 hours a day over 92 days (June–August) at Idaho’s July 2026 average of 13.73¢/kWh. The hours are the national 3.6 h/day baseline scaled by NOAA CPC state population-weighted CDD, June–August 2026 (504 vs the CONUS 958); your utility’s rate moves it (table below), and the calculator takes your own wattage, hours and rate.

Idaho runs window air conditioner less than the national baseline in June–August — 1.9 hours a day on the NOAA state degree-day scaling used here, against 3.6 nationally — and pays 13.73¢/kWh for it. Those two numbers, times 1,100 W, are the whole $26.

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

Window air conditioner cost per day and per summer in Idaho at 1 to 12 hours a day, at the state average rate and its largest utilities' EIA-861 prices
Hours per day Idaho avg 13.73¢ Idaho Power Co 11.8¢ Avista Corp 11.6¢ PacifiCorp 12.1¢
1 h $0.15 / $14 $0.13 / $12 $0.13 / $12 $0.13 / $12
2 h $0.30 / $28 $0.26 / $24 $0.26 / $23 $0.27 / $24
4 h $0.60 / $56 $0.52 / $48 $0.51 / $47 $0.53 / $49
6 h $0.91 / $83 $0.78 / $72 $0.77 / $70 $0.80 / $73
8 h $1.21 / $111 $1.04 / $96 $1.02 / $94 $1.06 / $98
12 h $1.81 / $167 $1.56 / $143 $1.53 / $141 $1.60 / $147

What Idaho’s utilities charge for it

Idaho'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 1.9 h/day
Idaho Power Co 525,751 11.8¢ $0.13 $23
Avista Corp 128,226 11.6¢ $0.13 $22
PacifiCorp 74,170 12.1¢ $0.13 $23

What the numbers say about window air conditioner in Idaho

Idaho logged 504 population-weighted cooling degree-days over June–August (NOAA CPC state series), 53% of the CONUS figure of 958, which is why this page runs window air conditioner 1.9 hours a day against the national 3.6 — 1.7 hours less. At Idaho’s July 2026 rate of 13.73¢/kWh that makes it the 16th most expensive of the 20 cold states for window air conditioner: $26 for the 92-day summer, against Montana’s $14 and Alaska’s $68. Idaho Power Co, Idaho’s largest utility with 525,751 residential customers, averages 11.8¢ — $23 for the same hours — while PacifiCorp at 12.1¢ comes to $23, a $1 spread on identical use. Idaho’s July 2026 rate of 13.73¢ sets the $0.15 per hour; its winter average of 12.38¢ is 1.35¢ 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 Idaho?

$0.15 an hour for a 1,100 W unit at Idaho’s July 2026 average of 13.73¢/kWh (1,100 ÷ 1,000 × 0.1373); at Idaho Power Co’s 11.8¢ it is $0.13.

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

About $26: 1,100 W × 1.9 hours a day × 92 days (June–August) × 13.73¢. The hours are the national 3.6 h/day scaled by NOAA CPC state population-weighted CDD, June–August 2026 (504 against the CONUS 958); enter your own hours above for your own figure.

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

Idaho is the 16th most expensive of the 20 cold states on this site at $26 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 Idaho: 1,100 W ÷ 1,000 × 0.1373 $/kWh = $0.15 per hour; hours per day = 3.6 × (504 ÷ 958) = 1.9; 1,100 ÷ 1,000 × 1.9 × 92 × 0.1373 = $26 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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