I agree, south facing windows are a must and do add more heat than they release. Didn't the article say only to limit east/west/north windows though? BTW, seriouswindows have an R rating of up to R13 I think for a non-opening window and R11 for a casement window. I have no idea what price they command though.
The thing that puzzled me was this:
Quote:
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Place fireplace on second floor...
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Why the second floor?
I do know you can get high efficiency fireplace inserts that are great for heating. However, like strider mentioned, traditional fireplaces can actually cool the house instead of heating it since they use the warm air from the house to burn the wood which pulls in cold air from outside.