As of July 3, 2019, furnaces and gas package units can no longer be manufactured unless they meet a minimum level of energy efficiency. FER stands for Fan Energy Rating and is a federal regulation that sets a minimum airflow efficiency standard for residential furnace fans and gas packaged units in order to save energy and reduce carbon pollution.
AFUE, or Annual Fuel Utilization Efficiency, measures how efficiently a gas furnace converts fuel to energy. The higher the AFUE, the more efficient the gas furnace.
SEER measures the efficiency of a heat pump or air conditioner over an entire cooling season. The higher the SEER, the more efficient the system.
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