Typical condensing furnaces have an AFUE rating of at least:

In the context of gas furnaces, the Annual Fuel Utilization Efficiency (AFUE) rating is a critical measure of how efficiently a furnace operates. Typical condensing furnaces are designed to recover more heat from the combustion process by utilizing the exhaust gases. This advanced efficiency in design allows these furnaces to achieve higher AFUE ratings.

A rating of 90% or above indicates that the furnace converts 90% of the fuel it consumes into usable heat, with only 10% lost through the exhaust. This is a standard benchmark for condensing technology, which distinguishes it from traditional furnaces that typically have lower efficiency ratings, often starting at around 80%. Thus, the choice of 90% reflects the capability and advantage of modern condensing furnaces in energy conservation and performance, making them an optimal choice for consumers looking to reduce their fuel consumption and utility bills.