What good is a powerful heating and cooling system if air can leak in and out around the ducts? This sticky, cement-like product does a terrific job sealing around ducts so these leaks don't happen, making a building more energy-efficient. Mastic works better than duct tape for this purpose. It can also be used to seal cracks in walls. Water-based, VOC-free mastics are available.
This is the technology that makes solar power happen. A panel of semiconductor material (typically silicon) harnesses the sun's energy and converts it directly into usable electricity, at the atomic level. Also called solar cells, PV cells provide a source of renewable energy. PV cells can be small-the size of roof tiles-and they can be installed on homes, or they can be large and arranged in groups of thousands to serve as power plants for whole communities.
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