You all are very welcome ... I'll definitely be doing this when I get a new greenhouse.
Something occurred to me earlier. When I lived in England I had a heater that was called a 'trickle down' heater. There were something like bricks that held heat and in the daytime low voltage would be used to heat the bricks ... considering how much heat this thing can put out, it might be worth looking into a way to have all this heat get stored then released at night.
