Are you looking to have a new heating system installed in your house? If you are, one of the most important bits of information you’ll want to find out about potential models is their efficiency. A high-efficiency furnace uses less energy to provide more heat, and therefore costs less to run.
Or at least, that’s what it seems to mean.
The truth is a bit more complicated. Efficiency is a rating of the heating output of a furnace compared to the amount of energy it uses. This doesn’t necessarily mean that a furnace with a higher efficiency rating will automatically cost less to run. A good example of this is the difference in the efficiency ratings of gas furnaces and electric furnaces.