Indoor air conditioning is one of the best ways to beat the summer heat. For many, the convenience of central air remains out of reach, which leaves the window AC unit as the next best thing.
Today’s window air conditioners are much better than what you might be used to, and nothing like the massive energy hogs they once were. Modern window units provide relief from searing temperatures, remove humidity and use less electricity than ever before.
However, if you don’t do your homework, it’s easy to end up with the wrong machine. You might get stuck with something too big, too small or that simply doesn’t fit where you want.
What Size Air Conditioner Do You Need?

BTU 5,000-6,500

BTU 7,000-8,500

BTU 9,800-12,500
The Rules for Keeping Cool
Window air conditioners typically have a cooling capacity ranging from 5,000 to 12,500 British thermal units (Btu/hr.). As a rule of thumb, an air conditioner needs 20 Btu for each square foot of living space.
But other considerations, such as the ceiling height and the size of your windows and doorways, might call for more cooling power.
To measure your room, multiply the length by the width. Add together the size of rooms that aren’t separated by doors, because the air conditioner will need to cool both spaces. Energy Star recommends that you make adjustments for the following circumstances:
• If the room is heavily shaded, reduce capacity by 10 percent.
• If the room is very sunny, increase capacity by 10 percent.
• If more than two people regularly occupy the room, add 600 Btu for each additional person.
• If the unit is used in a kitchen, increase capacity by 4,000 Btu.
Showing 1–21 of 74 results
-
DELLA 12,000 BTU Mini Split Air Conditioner & Heater Ductless Inverter System, 17 SEER 208-230V Energy Efficient Unit W…
$779.96 Learn More -
Frigidaire Window-Mounted Room Air Conditioner, 15,100 BTU, in White
$529.00 Learn More -
Honeywell 8,000 BTU Compact Portable Air Conditioner with Dehumidifier & Fan, Cools Rooms Up To 350 Sq. Ft, Includes…
$532.57 Learn More -
Amazon Basics Window-Mounted Air Conditioner with Remote – Cools 450 Square Feet, 10000 BTU, Energy Star
$338.24 Learn More -
GE Profile, 2-in-1 Smart Air Conditioner & Dehumidifier for Window, 6,150 BTU, Ultra-Quiet Series, Easy Install Kit…
$299.00 Learn More -
LG Energy Star 12,000 BTU 115V Window-Mounted Air Conditioner with Wi-Fi Control, 12000, White
$379.95 Learn More -
KEYSTONE LCD 5,000 BTU Window Mounted Air Conditioner Star | Follow Me Remote Control | Energy Saver Sleep Mode | Timer…
$239.99 Learn More -
ROVSUN 8000 BTU Window Air Conditioner, Energy Saving AC Unit with Remote Control & Timer Function Ideal for Rooms up to…
$249.99 Learn More -
Friedrich SL36N30B Commercial Kuhl Window/Wall Air Conditioner 9.0 EER, 36000 BTU
$3,304.84 Learn More -
13,700 BTU – ENERGY STAR – 115 volt – 12.2 EER Kuhl Series Room Air Conditioner
$1,499.00 Learn More -
Friedrich CEW24B33A Chill Premier Smart Air Conditioner Window Unit, WiFi Mobile Control, White, Heating & Cooling…
$1,200.00 Learn More -
Midea 8,000 BTU U-Shaped Smart Inverter Window Air Conditioner–Cools up to 350 Sq. Ft., Ultra Quiet with Open Window…
$399.00 Learn More -
GE Electronic Air Conditioner for Window | 6,000 BTU | Easy Install Kit & Remote Included | Complete With 3-Speed Fan…
$229.88 Learn More -
GE Electronic Window Air Conditioner 6000 BTU, Efficient Cooling for Smaller Areas Like Bedrooms and Guest Rooms, 6K BTU…
$223.00 Learn More -
Keystone 6,000 BTU Window Mounted Air Conditioner | Follow Me LCD Remote Control | Energy Saver Sleep Mode | 24H Timer…
$265.29 Learn More -
Emerson Quiet Kool EARC15RE1 15,000 BTU 115V Window Air Conditioner with Remote Control, White
$659.99 Learn More -
DELLA 8,000 BTU 115V/60Hz Energy Saving Window Air Conditioner, Whisper Quiet AC Unit with Remote, Cools Up to 350…
$279.96 Learn More -
Energy Star 6,000 BTU Window-Mounted Air Conditioner with “Follow Me” LCD Remote Control
$268.39 Learn More -
Friedrich SM21N30E Commercial Kuhl Window/Wall Air Conditioner 9.8 EER, 20500 BTU
$2,894.62 Learn More -
Friedrich UE10D33C 10000 BTU Uni-Fit Series Room Air Conditioner with Electric Heat, 230-volt
$1,563.16 Learn More -
Friedrich CCW18B30A Chill Premier Smart Air Conditioner Wall & Window Unit, WiFi Mobile Control, White, Cooling Capacity…
$900.00 Learn More