An energy efficient furnace will also save you a lot of money. Purchase an energy efficient furnace with a high AFUE percentage. If you have a 95% AFUE furnace, then for every $100 in heating costs, you could save about $23.  Call us at 3030-993-9060 and visit your Denver heating and cooling specialist, Premier Air Colorado, online for more information and to schedule an appointment at www.premieraircolorado.com .