Buying a used air compressor is a lot like buying a used car. Air compressors can be as expensive as cars, and it’s tempting to try and get the best deal possible by buying a used machine. Unlike cars, though, the market for used air compressors is not as big. The technology for air compressors hasn’t changed much in the last decade, and air compressors last between 10 and 30 years depending on quality. Business ow…