Best Window Air Conditioner for a Small Bedroom
Buy the Midea 5,000 BTU EasyCool for a bedroom up to 150 sq ft, the Midea 6,000 BTU U-Shaped up to 250 sq ft, or the TCL 8,000 BTU Q-Series up to 350 sq ft. BTU is cooling power: match it to your room, because a unit that is too big leaves the air damp. Running cost is $72 to $100 a year at 1,000 hours of use.
Our pick for each room size
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Check price on AmazonUp to 150 sq ft
Midea 5,000 BTU EasyCool (MAW05M1BWT)
5,000 BTU · CEER 13.1, efficiency certified by the U.S. Department of Energy for this Midea model series · about $72 a year to run · $159.99 on Amazon
The smallest size, for a bedroom about 12 by 12 feet or less, and the lowest price of the three.
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Check price on AmazonUp to 250 sq ft
Midea 6,000 BTU U-Shaped (MAW06V1UWT)
6,000 BTU · CEER 15.1, ENERGY STAR and DOE certified · about $75 a year to run · $314.99 on Amazon
For a typical bedroom. It costs more than the TCL because it has the highest efficiency rating of the three picks, and for a room up to 250 sq ft an 8,000 BTU unit would be too big. Midea lists its U-Shaped 6,000 BTU line as low as 32 dBA.
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Check price on AmazonUp to 350 sq ft
TCL 8,000 BTU Q-Series (H8W4KW)
8,000 BTU · CEER 15.0, ENERGY STAR and DOE certified · about $100 a year to run · $249.95 on Amazon
For a large bedroom or a small bedroom with a lot of sun. Inverter (variable speed) for lower power use.
CEER is the efficiency rating; higher means a lower power bill. Amazon prices as of November 11, 2026.
ENERGY STAR’s sizing chart: up to 150 sq ft needs 5,000 BTU, up to 250 sq ft needs 6,000 BTU, and up to 350 sq ft needs 8,000 BTU. A room of 250 to 300 sq ft is 7,000 BTU on that chart, and the 7,800 BTU Midea in the table below is the nearest size; the 8,000 BTU TCL is the next size up. Add 10% of BTU for a very sunny room, and 600 BTU for each regular user over two. The BTU calculator does the math.
Other 7,800 to 8,000 BTU window ACs you can buy today
Every unit here is certified by ENERGY STAR and DOE and has an Amazon listing we checked. Lowest price first; our three picks are above. Prices as of November 11, 2026.
| Unit | BTU | Room size | CEER | Per year | Price | |
|---|---|---|---|---|---|---|
| 8,000 | up to 350 sq ft | 15.0 | $100 | $289.99 | Check price | |
| 7,800 | up to 300 sq ft | 15.1 | $97 | $299.99 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $322.99 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $349.99 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $359.00 | Check price | |
| 8,000 | up to 350 sq ft | 14.5 | $104 | $399.99 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $413.04 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $429.99 | Check price | |
| 8,000 | up to 350 sq ft | 15.0 | $100 | $499.00 | Check price | |
| 8,000 | up to 350 sq ft | 14.5 | $104 | $569.99 | Check price |
CEER is the combined efficiency rating; higher means a lower power bill. Running cost is 1,000 hours of cooling a year at 18.83 cents per kWh, the average U.S. residential rate (EIA), the same basis as the window AC vs mini split page. Room size is from ENERGY STAR’s chart for the unit’s BTU. See every size of window AC or window ACs for large rooms.
Common questions
What size window air conditioner do I need for a small bedroom?
Match the BTU to the room. ENERGY STAR’s sizing chart says up to 150 sq ft needs 5,000 BTU, up to 250 sq ft needs 6,000 BTU and up to 350 sq ft needs 8,000 BTU, for an 8-foot ceiling.
Is a 5,000 BTU window air conditioner enough for a bedroom?
Yes, if the room is 150 sq ft or less, about 12 by 12 feet. For a larger bedroom, a sunny one, or more than two people, step up to 6,000 BTU.
Is a bigger window air conditioner better in a small room?
No. A unit that is too big cools the air before it dries it, so the room feels cold and damp. Pick the size for your room.
How much does a small window air conditioner cost to run?
About $72 to $100 a year for the three picks, at 1,000 hours of cooling a year and 18.83 cents per kWh.
Will it fit my window?
A standard window unit fits an up-down (double-hung) window. Measure the opening width and check it against the width range in the unit’s manual before you order. A crank-out window, the kind that swings open on a hinge, needs a unit made for it, a portable AC or a mini split.
Room sizes are from the ENERGY STAR room air conditioner sizing chart. Efficiency ratings (CEER) are from ENERGY STAR and the DOE Compliance Certification Management System; the Midea 5,000 BTU EasyCool takes the CEER 13.1 that the U.S. Department of Energy lists for the five Midea MAW05M1 models. The 32 dBA figure is from Midea’s product page. Running costs are our computation from those ratings. Amazon prices are what Amazon showed on the date under the picks. See methodology.