Best efficiency
Mini-splitENERGY STAR
MRCOOL DIY 4th Gen 12K
Cooling
12,000 BTU
Covers
500 ft²
Efficiency
22 SEER2
Noise
32 dB
$1099 est.
typical retail price Cool North · ~12¢/kWh · 3-month season
Air conditioning in Wyoming: sizing, costs & the right units
Wyoming is high, cool, and dry: Cheyenne, Casper, and the high plains see hot, dry afternoons in summer, but altitude and very cool nights keep the cooling season short and mild. It's one of the lowest AC-use states in the country, though hot, dry July stretches still warrant a unit in the warmest valleys.
Updated June 2026
What to look for in Wyoming
High altitude, dry air, and cool nights mean most Wyoming homes need cooling only for the hottest afternoons — a single efficient unit or a heat-pump mini-split is plenty, and the mini-split earns its keep against the long, cold winter. Intense high-altitude sun makes sun exposure the biggest sizing factor; cheap power keeps running costs minimal.
What cooling costs in Wyoming
Estimated at Wyoming's average residential rate (~12¢/kWh, approximate) and 8 hours/day. "Per season" assumes 3 cooling months. Your utility rate and usage will vary.
| Unit | Efficiency | Est. / month | Est. / season |
|---|---|---|---|
| Senville LETO SENL-12CD Mini-split | 21.2 SEER2 | $19 | $57 |
| LG Dual Inverter LW1022IVSM Window | 15 CEER | $19 | $57 |
| BLACK+DECKER BPACT14WT Portable | 6.1 CEER | $66 | $198 |
Climate-matched
All 49 units Units that fit Wyoming's climate
Editor's pick
WindowENERGY STAR
LG Dual Inverter LW1022IVSM
Cooling
10,000 BTU
Covers
450 ft²
Efficiency
15 CEER
Noise
44 dB
$429 est.
typical retail price
WindowENERGY STAR
LG LW1521ERSM 15,000 BTU
Cooling
15,000 BTU
Covers
800 ft²
Efficiency
11.8 CEER
Noise
53 dB
$549 est.
typical retail priceWyoming AC questions, answered
How many BTU do I need in Wyoming?
Use the Cool North zone and weigh sun exposure heavily — the thin, high-altitude air and intense sun matter more than raw square footage. A 300 ft² room lands near 6,000–6,800 BTU, more for a sun-blasted west-facing room.
Do I need AC in Wyoming?
Often only for the hottest summer afternoons — high altitude and cool nights let most homes coast. But hot, dry July stretches in Cheyenne and Casper make an efficient unit worthwhile, and a heat-pump mini-split also handles the long winter.
What does AC cost to run in Wyoming?
At ~12¢/kWh and a short season, an efficient 12,000 BTU unit runs about $18–25/month when running — among the lowest annual cooling costs in the country.
Electricity rates are approximate state averages; check your utility bill for your exact rate.