A good trick for home shops is to have a portable compressor, but also have a large storage tank fixed mounted in the shop. You connect the two with a quick-connect line so you have the option of either system. I use an 80 gal hung from the ceiling as the storage unit and have shop line drops coming from it. Works great and lets you have instant 125 psi when needed w/o having to start a compressor..just use a check valve between the two.