My first day visiting Albuquerque, I was in pizza parlor picking up an order, and the news was on a TV nearby. They were covering the arrest of this cracked out looking couple. The lady behind the counter then explained to me that it was a big local story because those two had tortured and murdered their daughter. Its also the cartheftt capital.
I haven't been back.
The problem with this is entropy. Heat dissipated to the environment is highly entropic (more disorganized, less useful heat/energy), and to effectively extract it, you'd need to reduce the entropy, which requires more energy that you would get from the heat you recovered.