hey guys

If you heat a gas above its critical temp the refrigerant will not condense no matter what the pressure is, but if you reduced the temperature back down below critical temp, will it the be able to change state again?

why i ask is that back at TAFE me teacher told me the gas would be "burnt" and result in the gas never being able to change state again and would need to be replaced.
i work with another technician who disagrees. what are your thoughts?