When working with refrigerants, it's important to wear appropriate personal protective equipment (PPE) to prevent personal injury 4, 5, 6, 7, 8, 9, 10, 11, 12. Contact with refrigerant can cause frostbite, and inhaling refrigerant gas can be harmful 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Protective goggles are essential when opening refrigerant lines, even if the system appears empty 4, 5, 6, 7, 8, 9, 10, 11, 12. Also, avoid smoking when servicing air conditioners or when refrigerant gas may be present, as inhaling refrigerant through a lit cigarette can be fatal 4, 5, 6, 7, 8, 9, 10, 11, 12.

In general, when performing maintenance or repairs, wearing protective gear such as safety glasses, gloves, a hardhat, and protective shoes is recommended 1, 2, 3.