Cooling capacity ought to be your first thought before purchasing a window AC. Cooling force is measured in British Thermal Units, or BTUs, per hour–the fundamental measure of warm energy. For the best productivity and adequacy, stay with a unit that has a BTU level intended to fit your space. A window AC with too little BTU force will run persistently to attempt to cool a vast space and, all the while, will gobble up your energy spending plan. A window AC that is too extensive for your space won't cool and dehumidify your space uniformly, leaving your room air helpless to uncomfortable hot and frosty pockets.
To locate your optimal cooling capacity, ascertain the measure of the space you need cooled in square feet. At that point utilize the diagram underneath to locate the appropriate measure of BTUs.
| Area To Be Cooled (Sq. Ft.) | Capacity Needed (BTUs Per Hour) |
| 100 to 150 sq. ft. | 5,000 BTUs |
| 150 to 250 sq. ft. | 6,000 BTUs |
| 250 to 300 sq. ft. | 7,000 BTUs |
| 300 to 350 sq. ft. | 8,000 BTUs |
| 350 to 400 sq. ft. | 9,000 BTUs |
| 400 to 450 sq. ft. | 10,000 BTUs |
| 450 to 550 sq. ft. | 12,000 BTUs |
| 550 to 700 sq. ft. | 14,000 BTUs |
| 700 to 1,000 sq. ft. | 18,000 BTUs |
| 1,000 to 1,200 sq. ft. | 21,000 BTUs |
| 1,200 to 1,400 sq. ft. | 23,000 BTUs |
For a more definite assessment, think about these factors, as well:
Roof Height — The appraisals above accept customary 8-ft. roof statures. You might need to expand your BTU level if your roofs are higher than 8 ft.
Daylight — Is your room sunny amid the day? Provided that this is true, build your BTU power by 10 percent.
Number of People — Will more than 2 individuals consistently possess the room? For each extra individual, you'll need 600 BTUs of cooling capacity.
Kitchen — Will you be introducing your window AC in a kitchen? Provided that this is true, expand the capacity by 4,000 BTUs.
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