Air Conditioning


Old 04-28-03, 06:43 AM
janet cuthbert
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Question Air Conditioning

What is the formula for measuring a room or area for an air conditioning unit - we need to measure square feet to arrive at a btu - is it room height x width x length?
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Old 04-28-03, 07:47 AM
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Dear Janet--

Using sq. footage is a rough method for estimating btu's needed for a room or home as it does not take into account type of construction, hidden btu's from other sources, etc. A load calculation is always best to make sure you don't oversize or undersize the a/c for proper airflow and humidity removal.
Spending a few extra bucks now for the calculation can save you hundreds in operating and repair costs in the future.

Nonetheless, here is the rule of thumb:

For heavy insulated areas use,
length x width divided by 400 x 12,000= approx. btu's of cooling needed

For light-medium insulated areas use,
length x width divided by 450= x 12,000= approx. btu's of cooling needed
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