A large uninsulated home might require 1.1 million Btu of heat energy from the furnace on a cold winter day. What is the cost in dollars to heat this house for that day with natural gas, assuming a 60 percent furnace efficiency? (Note: on my latest bill, it says I pay one dollar for every “therm” which is 100 cubic feet of natural gas) (Please do not enter a dollar sign. E.g. if the cost is 17 dollars and 25 cents, enter 17.25) (Think a little about your answer – what’s a winter heating bill look like for the owners?)