What exactly is air infiltration on windows & why isn’t it reported on the NFRC sticker?
Thanks for this great question. It is easy to get confused about this. Air infiltration is when air flows unintentionally into a house through gaps and cracks in the building envelope. In fact, about 30% of your heat loss may come from gaps and cracks around the windows and doors in your home.
Air infiltration, more [...]
