Start date:
End date:
Lead country:

The United States

Participating countries

Austria, Canada, Japan, the United States

Cold Climate Heat Pumps (Improving low ambient temperature performance of Air-Source Heat Pumps)

The goal of this Annex was to identify technology solutions leading to successful (efficient & reliable) systems/equipment for residential and small commercial buildings in cold climate locations, with the primary focus on air-source heat pumps.


    • Identify potential equipment & system options for detailed evaluation
    • Determine energy savings potential over range of cold climate locations
    • Develop final Annex report comparing various design options for cold climate heat pump applications on common basis