I've got a Craftsman 2 hp oiless. It's junk. It is so noisy that I don't even know how they can sell them.
We got a HF 2 hp tank style with a piston compressor. Heck it' almost as bad. We stuck it under the house in the crawl space which is heavily insulated and it still can drive you crazy. I moved it over to the streetrod garage and it is is so bad that I only use it when I really need it and just wear ear muffs. I tried enclosing it in an insulated box, but it just made a different but still loud and obnoxious noise.
I think noise is inherent with air compressors. Even a screw compressor is noisy.