The project aims to develop and demonstrate a smart combined heat pump heating and hot water system that can respond to dynamic price and emissions signals to shift the majority of the space and water heating load off-peak. As heating and hot water are responsible for two thirds of U.S. homes’ energy use, this capability has the potential to significantly reduce grid system costs, user energy bills, and climate and air pollution once deployed at scale. Thanks to its ability to store renewable energy in its thermal battery to avoid drawing on the grid when electricity is dirtier, each Harvest Thermal system reduces carbon emissions by 50 metric tons over its life, more than a mid-size electric vehicle and at a lower cost.