Energy efficiency. It’s a big concern people have about appliances today. It isn’t enough for an appliance to work, it should also work without unnecessarily draining power. Modern manufacturers know how important this is to customers and make their products to match, and the U.S. Department of Energy has put in place the ENERGY STAR program to test and mark products that conserve power.
The efficiency question is a vital one for furnaces because they are essential appliances for home comfort and because they consume a large amount of energy each winter. An electric iron with the ENERGY STAR label may save a few cents. A high-efficiency furnace can potentially save hundreds of dollars.