Most homes in the US are heated by central furnaces or boilers. Furnaces heat air and distribute the air through a system of ducts.
The efficiency rating for a furnace is measured by annual fuel utilization efficiency or AFUE, which is the ratio of heat produced for the home to use compared to the total energy consumed by the furnace. For example, a furnace with a 90% AFUE rating means that 90% of the total energy consumed can be used by the home for heating and 10% is lost to the atmosphere. The current federal minimum AFUE for non-condensing, fossil-fueled furnaces is 78%. Replacing an existing 60% AFUE furnace with a 90% AFUE furnace can save you 33% on your heating costs!
To check if there are any incentives or rebates available for this product in your area, please visit the Database of State Incentives for Renewables and Efficiency (DSIRE).
On Energy Star Qualified list ( >= 90% AFUE).