First post here.

I've been reading up on our (US) EPA rules regarding HC refrigerants. They are now legal for some equipment if it was specifically manufactured for HC. They are not legal substitutes for R12 or R22. They are also not legal for automotive use.

Several companies are selling "drop-in" replacements on ebay. The EPA just issued a press release warning us to stay clear of them. The fact that these HC's offered on ebay are in some cases more expensive than legal refrigerants tells me the sellers are targeting illegal users anyway.

Doug