Generally very little, if any
The EPA.
Only come from Recovery, Recycling, and reclamation
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Hermetic compressors rely on refrigerant gas for cooling. When drawing deep vacuums during the recycling or recovery process, there may not be enough refrigerant gas circulating to adequately cool down the compressor. This can lead to overheating of the compressor and potential damage to the equipment.
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It's illegal to vent the refrigerant into the atmosphere. To do it legally, you need a refrigerant recycling machine
Recycling equipment can be bought from many different stores online and offline. Some examples of stores that sell recycling equipment include Go Green Rei and REMFG.
With a refrigerant recovery and recycling machine.
AMCOR specializes in recycling. They offer domestic and commercial recycling collection services, as well as recycling equipment supply and servicing.
Recycling (Terry WB Gohring)