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There is no requirement as such. Watts is a use of power. For example, Al Gore uses more power per square foot then most of us do. A well run home will use about 500 KWH's of power in a month (on average). A poorly managed home may well run ten times this amount.

Size only changes the heating and air handling costs. If a home uses gas heating the overall cost will also go way down.

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15y ago

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