Windows are An important place of heat exchange in households. In the course of colder months, warmth from inside can escape from the windows, although in hotter months, outdoors warmth can penetrate indoors.- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -