Shawn and John,
Many thanks, that is exactly the kind of information I needed.
Unfortunately propane and electric prices are high in Calif.
We have two propane heating units in the house that are separate for the upstairs and the downstairs, I'm trying to find a way to isolate a couple of rooms, the kids and ours (upstairs/downstairs) without using both heaters to heat the entire house.
What I think I'll try to do is use the portable inexpensive space heaters in the 2 target rooms for a month and compare my electric costs to the savings in propane costs. The temps here rarely drop below 20F at night, but the wind helps cool things down since it is always blowing between 15 and 60 mph, and for a native Californian that's getting cold.
