There’s not really enough heat generated typically to be worth going through the losses of turning it back into electricity.
More advanced AC systems leverage full heat pumps to move heat around from places with more than wanted to places with less. Which is pretty effective at conserving energy in bigger buildings
I’m not 100% this example actually exists, but I would not at all be surprised if there are office buildings out there that use excess heat from their AC to heat hot water for the building
Huh that’s funny, “laying to rest” in English is an expression for burying someone after they have died