People who have very old furnaces or boilers can save more. But keep in mind that the average useful life of a furnace is just about 20 years. Many furnaces that are 20 years old or younger operate at efficiencies at or above 70 percent efficiency.

Are old furnaces less efficient?

Fuel efficiency isn’t the only way old furnaces fall short. The moving parts of older furnaces are also less efficient. As a result, you’ll spend more on electricity to operate your furnace’s fan, motor, and blower.

How efficient is a 10 year old furnace?

We have researched for you to help answer this question. As furnaces age, they lose their efficiency and waste energy. For example, a 10 to 15-year-old furnace can be only 70%-80% efficient or worse. So if you want to save money on your heating bills, getting a new furnace is a good idea.