In the bakery where I often go to write in the mornings they are having heating fitted. The cafe is in a warehouse and it gets cold in the winter. As I write, warm-air ducts are being installed overhead that circulate heat from a new gas-fired boiler.
Meanwhile, the room next door is so hot from the ovens that they use fans to vent the heat to the atmosphere. I asked isn’t there a way that they could use the waste heat from the ovens to heat the space we are in. The answer I got was that we asked and it is not possible.
I wonder how much more possible it would become if gas were not available. The challenge is the problem is not real enough. Sometimes I think it needs to get real bad before people will care about how much energy they are really using.