One of the problems with the air compressors is the noise. Some people in there shops have inclosed them or built seperate rooms for them. Another thought is put the intake outside through the wall. That might be find if out in the country but in town your neighbor might not like the thump,thump late at night when wanting to work late. Perhaps another thought is placing the intake in the rafters if you have an completely finished garage. I guess l always wondered in the winter sucking in that super cold air and wanting to paint how it would effect your spray gun and what you are spraying.
I made myself a homemade muffler I still have the the noise probably about 50% less than what it was. Used 16 ga put dividers in (something like a cutaway turbo muffler you see in car magazines) then nipples to screw in compresser and filter.

http://hotrodders.com/gallery/data/5...83DSC06641.JPG