Originally posted by: Ornery
Efficiency Myths: Replacement Windows
- ...all the window and door cracks add up to only a small fraction of the total square inches of the air leaking through the building shell. If the window and door cracks only add up to a small fraction of the hole, then the amount of money put into sealing these holes should not be such a big investment.
Most of a home's heat loss is through the ceiling. The balance is through the walls, doors and windows. If you spend $1,000.00 per year to heat your home, probably $800.00 of that is going out the roof. That only leaves $200.00 going out the walls, doors and windows. If you already have storm windows or thermopane glass, you'll only be able to improve them by 20% - 30% at best. Since the windows aren't the sole culprit in that $200.00 per year loss, you'll only realize a net savings of much less than $60.00 per year. One brand of window is not that far superior to another where efficiency is concerned. I'd be more concerned with how it looks or functions, than how efficient it is.