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• Heat Pump Qualified Product List (HPQPL)
• Mass Save | 2023 Air Source Heat Pump Minimum Efficiency Requirements

  The Department of Energy has developed a new procedure for testing heat pump efficiency called the M1 testing method. This testing method was designed to better reflect current field conditions and provide more accurate efficiency ratings.

• Air to Water Heat Pumps | Residential | Mass Save

  Air to water heat pumps can provide a total solution for heating, cooling, and hot water supply in a home.