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 Mixed / Temperate · ~32¢/kWh · 5-month season
Air conditioning in California: sizing, costs & the right units
California is really several climates: the coast barely needs cooling, but the heavily populated interior is brutal. The Central Valley (Sacramento, Fresno, Bakersfield) and the Inland Empire run 100F+ for months — that's where AC is a necessity, not a luxury. If you're buying an AC in California, you're almost certainly inland.
Updated June 2026
What to look for in California
California has the highest electricity rates in the country, so efficiency isn't optional here — it's the whole ballgame. An inverter unit that sips power pays for itself fast against 30+ cent power and a long inland season. The interior heat is mostly dry, so right-sizing is forgiving, but capacity for triple-digit afternoons matters.
What cooling costs in California
Estimated at California's average residential rate (~32¢/kWh, approximate) and 8 hours/day. "Per season" assumes 5 cooling months. Your utility rate and usage will vary.
| Unit | Efficiency | Est. / month | Est. / season |
|---|---|---|---|
| Senville LETO SENL-12CD Mini-split | 21.2 SEER2 | $50 | $250 |
| LG Dual Inverter LW1022IVSM Window | 15 CEER | $51 | $255 |
| BLACK+DECKER BPACT14WT Portable | 6.1 CEER | $176 | $880 |
Climate-matched
All 49 units Units that fit California's climate
Mini-splitENERGY STAR
Senville AURA 12K
Cooling
12,000 BTU
Covers
600 ft²
Efficiency
25.4 SEER2
Noise
24 dB
$1149 est.
typical retail price
Portable
LG Dual Inverter LP1419IVSM
Cooling
14,000 BTU
Covers
500 ft²
Efficiency
7.3 CEER
Noise
44 dB
$649 est.
typical retail priceCalifornia AC questions, answered
How many BTU do I need in California?
Use the Mixed/Temperate zone (or Hot & Dry if you're in the desert or Inland Empire). A 300 ft2 inland room lands near 6,500-7,500 BTU; dry heat lets you size close to the load without short-cycling worries.
What type of AC works best in California?
Given the power rates, a high-SEER2 inverter mini-split is the long-run winner — its efficiency edge compounds fast against the nation's priciest electricity over a long inland season.
What does AC cost to run in California?
At California's steep ~32 cents/kWh and 8 hours a day, even an efficient 12,000 BTU unit runs about $50-62/month — and an older fixed-speed unit can nearly double that. Nowhere does efficiency pay back faster.
Electricity rates are approximate state averages; check your utility bill for your exact rate.