What is a heat pump sizing chart?

A heat pump sizing chart uses the heating capacity of a heat pump combined with the average temperature of the area to determine the heating system required to maintain a comfortable temperature inside a home. A sizing chart allows users to compare different size heat pumps.

A heat pump extracts air from the outside to pump into a home, which results in reduced heating capacity in lower temperatures. The heating capacity for a home is typically very similar to the cooling capacity of an air conditioner. Sizing for a heat pump also requires the owner to determine heat loss, which is typically through windows and walls.