If it gets really bad you can triple ziplock bag some hand-warmers and submerge them close to circulation, I have done this once when we were without power for 12 hours, I had enough battery back up for a small pump, and the hand-warmers although unconventional do put out good heat.
I used freezer style ziplocks because of the thicker plastic, worked like a charm.
ps...
The warmers need little air in the bag once you get them going, mine lasted about 4 hours each.
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