I have been told by the HVAC supply houses it is due to warranty issues and certain parts such as compressors, line dryers and such you also are supposed to have the EPA cert. for refrigerant to install these parts. And as a byproduct it protects the trade.
Sorry, I don't buy that (excuse the pun)
a warranty can not be voided unless it is proved it was installed wrong, wrong part used, Etc.... this has nothing to do with requiring for a HVAC certificate, there is case law on warranty rejection, is in all cases where the manufacture tried to say the installer wasn't qualified the court ruled prove it was installed wrong, not just that they were not qualified.
you mean a manufacture can reject my warranty if I put a new oil filter on my car? spark plugs? brakes because I don't have a mechanic certificate? nope they have to prove they were incorrectly installed or the wrong part was used, I cant think of the name of the case law that pertains to this, I will try to look it up though, but, this is the same argument that they try to pull all the time, but it wouldn't fly in court.
so that leaves only one reason left. funny how the big name retailers can sell to whom ever they want? like Granger's??? Like Bob said refrigerant, and only certain ones can not be sold with out a valid EPA certification. and this isn't even an HVAC certificate, just and EPA issued one. These places wont even sell to you if you have the EPA version and not the HVAC one, and guess where you have to get that from:roll:
Myths and more Myths