DF&A’s designed a fully sustainable lake house using common sense and an awareness of the site, and adding innovative high-tech solutions. The LEED-gold certified house was one of the country’s first to use an in-ceiling hydronic radiant heating and cooling system; there’s no traditional forced air HVAC, just a geothermal-powered, thermally-active ceiling that can both heat and cool the house. An Ipe-clad rain screen covers much of the facade, keeping the sun from overheating the house, and the fully operable NanaWall in the main living space channels lake breezes to provide passive cooling.