I’m the sole occupant of an inefficient 1370 square foot townhouse, built in 1910, with one shared wall and three exposed sides. My thermostat is programmed to alternate between 62 and 68 degrees (though it rarely gets above 60 on my second floor). My last bill, generated on 12/26, was $219, but I don’t think that covers the extra-cold snap just before Christmas. I expect a few $300-400 bills in the months ahead.