30 May 2005
The efficiencies of U.S. heat pumps as well as markets for high efficiency heat pumps continue to
grow in the U.S. Heat pumps, however, are of much more value when there is a coincident need for the
heating and cooling produced by the heat pump. Some opportunities for simultaneous heating and cooling
• Combined heat pump space heating, cooling, water heating, and dehumidification
• Cool air from heat-pump water heating used for space cooling
• Exhaust heat from refrigeration and freezing used for space heating and hot water.
With the support of DOE, U.S. manufacturers and state organizations, research is underway on
combined or integrated heat pump systems that provide space conditioning and produce domestic hot
water efficiently. Integrated systems are targeted to be part of the solution in the development of Zero
Energy Housing. This paper discusses current activities, results and findings of sponsored U.S. research
to develop an advanced integrated heat pump that provides space heating, cooling, dedicated
dehumidification and water heater, and a water-heating dehumidifier for retrofit applications.