A New Testing Procedure
Variable capacity heat pumps, also called inverter-driven heat pumps, are becoming more popular in the United States. Consumers use this group of heat pumps, which includes ductless systems, every day for heating, cooling, and domestic hot water production. Currently, consumers and their contractors can look to the heating seasonal performance factor (HSPF) to compare models for energy efficiency. While HSPF is a useful rating system, it does not accurately evaluate heat pumps that operate at variable capacities.
A group of energy efficiency experts from across the United States and Canada have been working with researchers at Purdue University’s Herrick Laboratory to create a new, voluntary test procedure for these inverter-driven heat pumps to replace HSPF. The group is designing this new method to better highlight the benefits of variable capacity heat pumps and their controls. Learn more about how this new test can lead to better and more accurate product information for variable capacity heat pumps.