My electric blanket arrived!
If the electric blanket can hold itself at human body temperature, it forms an isotherm (across which there is zero heat transfer, equivalent to perfect insulation) between me and the room. While under the blanket, I can no longer tell what temperature the room is.
I switched off the furnace and set the blanket to 4 out of 10 half an hour before bed. I hopped into a toasty-warm bed, and although the temperature in the room fell to 50F, it was perfectly comfortable.
My furnace usage is down to one hour in the morning and six hours in the evening.
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