Please do post how this works for you - I've been mulling over doing something like this on my home, but am interested in how it actually worked for someone IRL (In Real Life).
Some interesting options I've pondered are:
MotherEarth's Heat Grabber-
http://www.motherearthnews.com/Do-It-Yourself/1977-09-01/Mothers-Heat-Grabber.aspx and:
http://www.mobilehomerepair.com/article17solar.htm Hope these links work.
(And that posting something means I won't get purged from your Permies email list!)
thx,
-geebee
