> If every home was insulated and had a heat pump, we'd all be richer. Yes of course. If every person had a flying car we'd all be richer too. > Why havent we

> If every home was insulated and had a heat pump, we'd all be richer. Yes of course. If every person had a flying car we'd all be richer too. > Why havent we done that? Perhaps because the (energy, work) cost of digging heat pumps for every home is too high for us to afford? How much energy is necessary to create a heat pump and how long does it take for it to pay off?