We've had two separate ones. One we used in the house, bought about nine odd years ago for around $100. Pile of garbage. Bought a new one last year for our caravan for around $130. Pile of garbage. The one in the house had a compartment where you put ice in and it would use that to cool the air it blew out. The caravan one sucked the air through the window and converted it to cool air with water.

Sorry! I don't know if they get better if you pay more but ours couldn't even cool down a small caravan by one iota.