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65 degrees absorber air conditioner aluminum foil amount of heat appliance atomic attic average barrels billion bimetallic strip Btu's building bulb burning carbon dioxide cardboard ceilings coal coil cold air collector convert cool cost cubic degree-days degrees Fahrenheit dioxide doors driving efficiency energy source ergy experiment Fahrenheit floor fossil fuels fuel oil furnace fusion power gallon gases gasoline glass heat flow heater hot water hour ice cakes ice cube inches infiltration inside insulation joules kilowatt-hours kinetic energy light liquid measure melt meter molecules natural gas neutrons nuclei passive solar percent plastic plywood power plants produce Record the temperature reduce heat losses solar energy stored stove strip sun's sunlight surface area Table tank temperature change temperature difference thermometer thermostat Trombe wall turbines turn unit of heat uranium vapor barrier warm wattage wire wood