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Keywords: FRONT VIEW OF THE SOLAR PATRIOT HOUSE.jpg PHOTOVOLTAIC SYSTEMS PASSIVE SOLAR DESIGNS GEOTHERMAL HEAT PUMP COMPACT FLUORESCENT LIGHTING AND HIGH EFFICIENCY APPLIANCES IT IS CONNECTED TO THE ELECTRICITY GRID BUT HAS THE CAPABILITY TO OPERATE AT LEAST 24 HOURS WITHOUT ELECTRICITY FROM THE UTILITY 2013-10-15 https //www flickr com/photos/departmentofenergy/10292234596/ ENERGY GOV other versions PD-USGov PHOTOVOLTAIC SYSTEMS Geothermal heat pump Uncategorized 2016 October 15 |