Hi, The idea is to freeze your own ice at home and put it in your EV before starting out on a hot day. The ice cools the coolant running through the existing evaporator coils in the car without the need of a compressor and other complications. All you need is a small circulation pump. I suppose you could also just run the cool water through the coils as it melts. Anyone ever tried this? This basic idea is already being used for other applications.