Don Foreman wrote:
... Ingersoll and Speedaire also make good compressors.
....

Make that " ... make SOME good compressors.". Not all of them are good.
I have an IR that is very noisy. It is oiled and belt-driven, but a
home-shop model. I forget the model, but it's 1 1/2 hp (?), 20 gal
tank. It does have an aluminum pump, so that might be the real difference.

Bob