[FitzIngarage]

With air tools you need to be concerned with CFM (air volume) ratings. It takes a lot of volume to run air wrenches and sprayers. I can't recall exactly, but I'd go at least 5.0 CFM. The trick is to check your tool requirements and then find a compressor that meets them. Then you'll need to determine if you want an oiled or oil-free compressor. Each has its merits. Oiled units tend to be more quiet and durable (the piston runs oiled like an automotive engine), but others may debate this and if you plan to do painting, an older oiled compressor *may* foul the airstream with a minute amount of atomized oil. This can be filtered out. Of course any oil in the airstream is welcome to air tools.