An acronym for Annual Fuel Utilization Efficiency, a measurement that shows how efficient a furnace is at generating energy from the fuel it uses. A unit with a higher rating is more fuel efficient than a unit with a lower rating.

Things you need to know

Some types of fuel are more energy efficient than others, but their cost can also vary. For example, electric is one of the most efficient fuels, but it is also one of the most expensive.

Cost Considerations

Units with a higher rating may not be the most cost-effective, because the most energy-efficient types of fuel can also be the most expensive.

Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.