Water heater/cooler

[kaybinster]

Sure it will work. Just put your hand above where the air leaves the unit when it is running -- that air is very cold. When you reverse the unit it takes heat out of the pool and dumps it to the air. A heatpump is just a reversible air conditioner. I am not sure of the economics of running it in cooling mode - it might be fairly expensive to operate.

[MarkC]

In cooling mode it makes the most sense to run the unit at night when the outdoor temperatures are the lowest. You will get more bang for the same buck this way.