Gas furnaces are similar to air conditioners in a way because they also come in all shapes and sizes. Gas furnaces use Propane (LP) or Natural gas to run burners that heat your homes. Gas furnace efficiency is based on percentages called AFUE!

AFUE measures a furnace's efficiency in converting fuel to energy. For instance, 80% AFUE for a gas furnace means it uses 80% of the gas energy it consumes and turns it to heat. Gas furnace percentages range anywhere from 80% all the way to 97%.

If gas furnaces are matched up with an outdoor heat pump, it’s called a duel fuel system. This system match-up is wildly desired by customers because it is considered one of the most efficient ways to heat your home!