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Site Visits and Estimates
To determine the most accurate BTU estimate, you should also consider these factors:
The first step in choosing a room air-conditioner is measuring your space to calculate its square footage.
Formula: Length x Width = Square Footage (sq. ft)
The table below shows a more accurate BTU estimate based on the square footage to be cooled.
|Area To Be Cooled (square feet)||Capacity Needed (BTUs per hour)|
|100 up to 150||5,000 BTUs|
|150 up to 250||6,000 BTUs|
|250 up to 300||7,000 BTUs|
|300 up to 350||8,000 BTUs|
|350 up to 400||9,000 BTUs|
|400 up to 450||10,000 BTUs|
|450 up to 550||12,000 BTUs|
|550 up to 700||14,000 BTUs|
|700 up to 1,000||18,000 BTUs|
|1,000 up to 1,200||21,000 BTUs|
|1,200 up to 1,400||23,000 BTUs|
|1,400 up to 1,500||24,000 BTUs|
|1,500 up to 2,000||30,000 BTUs|
|2,000 up to 2,500||34,000 BTUs|
Determining More Accurate BTU Estimates
- Ceiling Height
- The above estimates assume you have traditional 8-foot ceilings. If your ceilings measure higher than 8 feet, you’ll want to increase your BTU level.
- If your room or space is sunny during the day, increase your BTUs by 10 percent.
- If your room is shaded for most of the day, decrease your BTUs by 10 percent.
- Number of Occupants
- If more than 2 people will occupy your room or space regularly, you should add an additional 600 BTUs of cooling power for each person.
- If you are installing your window A/C unit in a kitchen, increase the BTU level by 4,000.
One of the most common mistakes in selecting a room air-conditioning unit is the purchase of an underpowered unit that will not properly cool the room. With the proper measurements and calculations, you will be able to determine the square footage of your room and make the wise choice for your next room A/C unit.
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