We did almost the same upgrade two years ago—went from old single-pane windows to double-pane, U-factor around 0.29, SHGC about 0.27. Comfort-wise, to...

Yeah, attic ventilation is definitely a biggie, but don't overlook the simpler stuff first. Had foggy windows myself and went through the whole attic ...

Good call on the fiberglass frames—I've had mine for about six years now, and they've held up really well. I used to have aluminum ones, and you're sp...

Had something similar happen last winter. Turned out it was mostly condensation from indoor humidity hitting the cold window frames. First thing I'd d...