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Another thing I've found is in subfreezing weather I can tell how much propane remains by looking at the frost line on the tank. This works when the propane is being drawn out and for a little while afterwards. I'm not sure if the frost is visible when no propane is being drawn. I don't think so.
I like the single tank at a time idea and think it would work well in many cases. But when it's cold enough that our lines could freeze if the furnace doesn't run I'm not sure I'd be comfortable using that approach. I'd probably not sleep well, worrying about it. Otherwise it would work just fine for me.
I like the trouble light idea, too, and I think next time we're in subfreezing weather for an extended period I will use that idea.
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