A/C compressor as air compressor question

Also, it depends on how heavy your use is. For certain you should plumb the intake into the clean side of your engine air filter, or use a GOOD intake filter.

Originally, AC compressor "top end" was cooled -and oiled- by the returning refrigerant charge Now that you have hot air in the intake, plus "heat of compression" the thing will be running a LOT hotter, and no top end oiling.

I would guess that for "occasional" use you are OK. If you are going to turn this into a "mobile garage" I doubt it will hold up too long.