Interesting you asked that, as the same thought had occurred to me !

I was at a friends house who had just put in an Inground Pool with an electric heater, which is only about 5 feet from his house A/C condensor. I looked at the two units sitting almost next to each other and thought "paying to get rid of heat and make heat at the same time. What a waste of money"

Surely some company must have made the connection.

Google-time