Today's Question comes from Jimmy Beasley. "Hey Dan, is this 7.5 kW electric heat kit for MRCOOL ProDirect Air Handler interchangeable with a York system?" I doubt it. The heat kits we have for those are supposed to be specifically for those. It might work with a York unit, but the problem there is that all the responsibility for that is on you. So if it ignites inside a York unit, causing an electrical fire that flies randomly out of control, and burns down the entire part of greater Santa Monica, then that's on you Jimmy Beasley. Neither we, nor York, nor MRCOOL will take any responsibility.