The window (frame) surface is cold, but the air in the apartment is humid. Humid air condenses on a cold surface (when it drops below the dewpoint temperature).
So you can either make the window fram ... read more
Like Jim said before, a proper attic insulation will help with lowering your electric bill as well as heat reflective roof shingles and exterior paint, ex. tex-cote. For windows we use Anlin, 100% ame ... read more