The CO2 Saver House in Lake Laka Poland weathers subzero winter winds and 90-degree summer heat. The home uses a solar water heater above the atrium for hot water that provides 30 to 40 percent in winter and 100 percent in summer. The orientation of the house is specifically designed to expose 80 percent of the structure to light and warmth through the sun’s daily arc. (The total surface area in a conventional building available for solar gain is typically about 65 percent.) The long side of the wedge on the CO2 Saver means there is more surface area to absorb solar energy, plus most of the roof slopes north to south, and all sides of the house have the potential to harvest power.
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