The collection of frost on a house's windows is beautiful,
but it can damage wooden framing, discolor varnished interior frames and
dislodge mitered corners on wooden or metal windows. Frost, usually accompanied
by underlying ice, forms when moisture collects on one side of a window drawn
into place by heat on the other. That's why a two-pane window offers more
protection from frost and ice formation.
It's difficult to scrape windows, once they're frosted over.
A hair dryer can help melt the ice and a towel can mop up excessive water. To
prevent frost from forming on windows, interior air should be warm and
relatively dry. By turning on a small electric heater in a room a couple of
hours before sundown, windows typically will not frost on the interior. Taping
or stapling plastic sheeting over the interior or exterior of windows can help.
Since drafty windows drive up heat bills, it's cost-effective to install storm
or thermal windows in many cases.