Probably going to get flamed, but I thought this video was interesting. Might come in handy some day.
This channel always has some interesting ideas that they test out. Not super scientific but I like their spirit.
What do you guys think about this unit? My 74 duster (360) is a non AC car.
http://cgi.ebay.com/ebaymotors/66-74-DART-DUSTER-DEMON-A-C-SYSTEM-67-68-69-70-71-72-AC_W0QQitemZ140223216416QQcmdZViewItem