If we’re talking about expanding to other potatoe-preparations, we might as well include a simple baked potatoe.

And, as a Bavarian, I cannot omit the glorious Knödel (in all it’s potato-based variations).

Not as AC, but a reversible heat pump can use the heating system for cold water circulation.

It’s rather limited, because you run into condensation concerns, but it’s still a possibility. A place I used to work at did this. It wasn’t perfect, but took some of the edge off.