I am looking at replacing my old shop air compressor and have been
looking at the rotary screw type compressors because they are quiet.
They are a lot more money than a piston type compressor. The smallest
ones I have seen are 5HP which would be about the right size for what I
want.

Does anybody whether they output clean air or is there a lot of oil to
be removed?

Would I need to run a big filter and refrigerated dryer to paint or use
a plasma cutter?

Thanks,
BobH