I work for Trane & I have worked on a MCC room with a window unit in the morning & that afternoon work on a 1400 ton centrifugal. It all pays the same so it really doesn't matter to me. I mostly work on, & prefer to work on process cooling applications in chemical plants. My accounts have low temp Carrier centrifugals, Frick & FES low temp screw compressor skids. I have a 5,000 ton & a 3,500 ton chiller plant at two different plants I take care of also. I am currently overhauling a CVHF1280.