What is the minimum AFUE rating for typical condensing furnaces?

The minimum Annual Fuel Utilization Efficiency (AFUE) rating for typical condensing furnaces is 90%. This rating indicates that the furnace converts at least 90% of the fuel it uses into heat for the home, which is significantly more efficient compared to conventional furnaces. Condensing furnaces achieve this efficiency by utilizing advanced technology that extracts additional heat from the flue gases before they are vented outside. This process not only improves the efficiency of fuel usage but also reduces energy costs and environmental impact.

Condensing furnaces are designed to operate at higher efficiency levels because their heat exchanger system allows for cooler exhaust gases, which can be condensed to extract more thermal energy. Therefore, the minimum AFUE rating of 90% serves as a benchmark for high-efficiency condensing units, marking a significant advancement over older, less efficient models.