HPN FLEX
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Where is the house, and how big is it?

Two answers and Flex knows the weather and the size. The rest takes three taps.

We use it to find the coldest typical day for this area.
Heated space only. A close guess is fine; you can fix it on the quote.
Rather type it all in one line?Flex reads the square feet, the year or decade, the ZIP, the floors, and the heat. When it has all of them it jumps to the result.