For heating, Simpatico installed a state-of-the-art Daikin Altherma system. The air-to-water heat pump setup creates hot water by drawing the heat from ambient air. (The system also provides heated water for the radiant floor heating.) This type of technology is more common in Europe but growing in popularity Stateside. The Daikin helped make the house all electric, moving it closer to its net-zero goal.