Yes it is every unit must be certified by epa and dated, older units before 1993 iirc get a gradfather clause and only need to evacuate to 10hg vacuum.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ???????? I forgot "you must"
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