Trane gas furnaces are built with high Annual Fuel Utilization Efficiency (AFUE) ratings, often reaching up to 96%, meaning that almost all the fuel consumed is turned into heat, reducing energy waste and lowering heating costs. More Ino: https://comfortzoneinsights.wordpress.com/2024/10/17/10-must-know-features-of-the-trane-gas-furnace-for-cozy-winters/