What size BTU furnace for my 2 story house?
#1
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What size BTU furnace for my 2 story house?
Should I double the square footage of my house to include the second floor when sizing my new furnace?
#2
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Location: Wet side of Washington state.
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No. You need to do a heat loss calculation and if you plan to also have central cooling then a heat gain calculation. There are several computer programs available to help you and they run from free (and worth every penny) to around $500. The free ones can get you into the ball park of knowing the correct size but for best results you want a program that allows you to input as much data as possible.
Do a Google search using the term heat loss calculation. There is a program that allows you to access it for a month (or maybe three) for $50 and many people on this forum have used it with glowing responses.
Do a Google search using the term heat loss calculation. There is a program that allows you to access it for a month (or maybe three) for $50 and many people on this forum have used it with glowing responses.