I just bought a 100-foot air line from Harbor Freight and snaked that through the walls from the garage to the basement shop. I added a moisture trap and a regulator at the basement end. The compressor runs at 125 psi and I can cut down the pressure in the shop to anything I need for pin nailers, etc. This is really convenient and probably cost less and took less effort than any kind of plumbing.
That being said, a friend used ordinary CPVC pipe which is rated at 200 psi..