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The amount of BTU's per square foot varies. The BTU's per ft2 in my area is 30-35. In your area there might be more or less.

For reference sake... Btu's are not used in Metric settings, Joules are used.

1 btu = 11356 joule

Contact a HVAC tech in your area. They can tell you the recommended BTU or JOULE rating for your area with the use of a manual known as a "J manual"

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To be proper, BTU should be all capitals as in the first sentence, though correct abbreviations are very awkward to use in many Microsoft applications!

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7y ago

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