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 · ~20¢/kWh · 4-month season
Air conditioning in Maryland: sizing, costs & the right units
Maryland runs humid and hot in summer across the populous Baltimore-DC corridor, with Chesapeake moisture adding to the load. Western Maryland's mountains are cooler, but most residents face a muggy, demanding July and August on a relatively short season.
Updated June 2026
What to look for in Maryland
Maryland has some of the highest electricity rates on this list, so efficiency is a genuine budget lever — an inverter unit that sips power pays back faster here than in the cheap-power South. Prioritize dehumidification for the Chesapeake humidity.
What cooling costs in Maryland
Estimated at Maryland's average residential rate (~20¢/kWh, approximate) and 8 hours/day. "Per season" assumes 4 cooling months. Your utility rate and usage will vary.
| Unit | Efficiency | Est. / month | Est. / season |
|---|---|---|---|
| Senville LETO SENL-12CD Mini-split | 21.2 SEER2 | $31 | $124 |
| LG Dual Inverter LW1022IVSM Window | 15 CEER | $32 | $128 |
| BLACK+DECKER BPACT14WT Portable | 6.1 CEER | $110 | $440 |
Climate-matched
All 49 units Units that fit Maryland's climate
Mini-splitENERGY STAR
Bosch Climate 5000 12K
Cooling
12,000 BTU
Covers
600 ft²
Efficiency
22 SEER
Noise
20 dB
$1299 est.
typical retail price
Portable
Hisense 8K Dual-Hose Inverter
Cooling
10,000 BTU
Covers
350 ft²
Efficiency
13.5 CEER
Noise
42 dB
$330 est.
typical retail priceMaryland AC questions, answered
How many BTU do I need in Maryland?
Use the Mixed/Temperate zone. A 300 ft2 room sizes to about 6,500-7,500 BTU; lean to the top of the range for the humid Bay corridor.
What type of AC works best in Maryland?
A high-efficiency inverter unit. With Maryland's steep power rates, the efficiency premium pays for itself faster than almost anywhere else on this list.
What does AC cost to run in Maryland?
At ~20 cents/kWh and 8 hours a day, an efficient 12,000 BTU unit runs about $33-42/month — and an older fixed-speed unit can cost well over $60, which is exactly why efficiency matters here.
Electricity rates are approximate state averages; check your utility bill for your exact rate.