These are a few files which were part of a long exchange in the newsgroup misc.consumers.house about heat loss in old houses.
See also the directory ../position.sun in which the formulas for solar radiation gain are discussed.
This page is
http://www.math.niu.edu/~rusin/uses-math/heatloss/index.htmlLast modified 1998/11/06 by Dave Rusin, rusin@math.niu.edu