ENERGY STAR®
Look for the symbol ENERGY STAR ® is an international symbol of energy efficiency. You can easily identify the best products to help you save energy and money, and protect the environment. Most Efficient The ENERGY STAR Most Efficient designation recognizes top of the line energy efficiency performance. An ENERGY STAR Most Efficient natural gas furnace has an annual fuel utilization efficiency (AFUE) rating of 97% or higher and a variable speed motor. A variable speed motor runs at different speeds to control the flow of heated or cooled air throughout the home. Better airflow control means a...