I'm world renown for my half-baked ideas, so here's one of mine to ponder:
Remove the oil or gas-fired furnace, and replace it with a fuel-efficient diesel or gas engine (outside, and with a good muffler). Capture the heat from the water jacket and hot exhaust to heat the house in the Winter, and generate power with the drive shaft. When the engine's running, it's back-feeding the grid; when it's not running you're taking power off the grid. In the cold weather I'll bet one would produce more than a household would consume. The question, therefore: Do I need a VW TDI or a Peterbilt?
