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Old 12-10-2011, 02:16 AM   #1
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Basement BTU's


I have a one bedroom apt. in the basement. The bedroom is 500 sq ft., the living room/kitchen area is 450 sq ft. My a/c installer just put in a Mitsubishi split ductless system, which has two air handlers and a condenser outside. Each unit is 9,000 btu's. My ceiling is 7ft 8in. and there's no direct sunlight. Is that enough? (Because my research keeps telling me I need 15,000 btu's in the bedroom and 13,500 btu's in the living room/kitchen area).
Please advise! Thanks

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Old 12-10-2011, 06:58 AM   #2
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Basement BTU's


That should be more then enough. Basements have very little cooling and heating loads.

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Old 12-10-2011, 07:01 AM   #3
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Probably have a lot more capacity then you need. Doesn't take much to heat or cool a below grade basement.
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Old 12-10-2011, 07:26 PM   #4
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Originally Posted by jgb0928 View Post
I have a one bedroom apt. in the basement. The bedroom is 500 sq ft., the living room/kitchen area is 450 sq ft. My a/c installer just put in a Mitsubishi split ductless system, which has two air handlers and a condenser outside. Each unit is 9,000 btu's. My ceiling is 7ft 8in. and there's no direct sunlight. Is that enough? (Because my research keeps telling me I need 15,000 btu's in the bedroom and 13,500 btu's in the living room/kitchen area).
Please advise! Thanks
500 sq ft bedroom?
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Old 12-10-2011, 07:34 PM   #5
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The OLD rule of thumb which was always too big was 1 ton per 1000 sq feet.
You have a ton and a half for 1000 sq feet.That plus in a normal basement the earth is insulating at least 3/4 of your walls.That means you have a much lower need than a stucture all above ground.Just be glad that each indoor unit has a thermostat or else it would freeze you out.
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Old 12-10-2011, 09:28 PM   #6
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500 sq ft bedroom?
Yes... I wanted to make a separate storage area, but the building dept won't allow me to put up any walls, so I have to keep it one huge room. (Which is fine).
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Old 12-10-2011, 09:30 PM   #7
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Yes... I wanted to make a separate storage area, but the building dept won't allow me to put up any walls, so I have to keep it one huge room. (Which is fine).

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