AFUE% – Annual Fuel Utilization Efficiency. A measure of a furnace’s heating efficiency. The higher the AFUE%, the more efficient the product. The government’s established minimum AFUE rating for furnaces is 78%.
Air Handler – The portion of the central air conditioning or heatpump system that moves heated or cooled air throughout a home’s ductwork. In some systems, a furnace handles this function.
Balance Point – An outdoor temperature, usually between 30° F and 45° F, at which a heatpump’s output exactly equals the heating needs of the home. Below the balance point, supplementary electric resistance heat is needed to maintain indoor comfort.
Btu – British thermal unit. The amount of heat required to raise the temperature of one pound of water (about one pint) by one degree F.
Evaporator Coil – The portion of a heatpump or central air conditioning system that is located in the home and functions as the heat transfer point for warming or cooling indoor air.
HeatPump – An air conditioner that contains a valve that allows it to alternate between heating and cooling.
Heat Source – A body of air or liquid from which heat is collected. With York heatpumps, the air outside the home is used as the heat source during the heating cycle.