Buying an air conditioner isn't just about picking the sleekest model; it’s about the math. The secret to perfect comfort is finding the right BTU (British thermal unit) rating. Here is how to calculate exactly what you need.
Buying an air conditioner isn't just about picking the sleekest model; it’s about the math. If you buy a unit that is too small, it will run constantly. If it’s too large, it will cycle off too quickly, leaving the air feeling humid and clammy.
The secret to perfect comfort is finding the right BTU rating. Here is how to calculate exactly what you need.
Measure the length and width of the room in feet and multiply them.
| Area to Cool (sq. ft.) | Required BTU Capacity |
|---|---|
| 150 to 250 | 6,000 BTUs |
| 250 to 350 | 8,000 BTUs |
| 350 to 450 | 10,000 BTUs |
| 450 to 550 | 12,000 BTUs |
| 700 to 1,000 | 18,000 BTUs |
Sunny room? +10% BTUs.
Shaded room? -10% BTUs.
Open kitchen? +4,000 BTUs.
Extra people? +600 BTUs/person.
An oversized unit cools too quickly and shuts off before removing moisture. This leaves your room cold but damp.
Not sure about the math? Let the Hamster team find the perfect tonnage for your specific apartment layout.
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