Mike - I've got some facts on A/C conversions collected at: http://teamchicago.com/imperial/imp-ac.htm the top link on this page is to an EPA site that has much technical & legal discussions of automotive cooling: http://www.epa.gov/docs/ozone/title6/609/609.html#factsheets > > Mmmmm...not quite. They still _reclaim_ and _recycle_ > R12, and you can buy R12 provided it is of this "used" > variety. I just took a course on the EPA's rules on > refrigerants. CFC's (like R12, R11, etc) are illegal > to produce. Period. HCFC's like R22 are legal for > sale and manufacture to licensed individuals, but only > for the next 20 years or so. Most commercial apps now > use HCFC's. R134a belongs to a third class, which are > completely ozone safe.