Insulation Calculator
It's sometimes difficult to decide what energy conservation investment will provide
the most comfort (and financial return). This spreadsheet should help you see
where your heating and air conditioning is going, and will let you compare
your upgrade options.
Although useful for quick calculations, this page is not intended to be a complete modeler
of building thermal performance. A number of programs, some free, are available.
See
this Department of Energy web page.
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