Quote Originally Posted by skate2snow
Oh BTW... What you can do useful with a compressor, is doing a recovery unit.... not really hard, any size is good, and it doesnt really need to pull a deep vacuum.... Its useful for those who has limited refrigerant resources....
this is correct, all early recovery units used hermetic compressors.

the industry is getting away from using them because you need to change the oil when you change refrigerent types. Most now are oiless.