As a final point, a fluorescent bulb gives off five times more light than does an incandescent. In conclusion, fluorescent lighting is the more efficient, more clean, more economical, and higher quality source of lighting. Heat Pumps Heating and cooling our homes through heat pumps rather than conventional systems can save two percent of our total energy. Because moving heat requires much less energy than generating heat, pumps provide up to four times the amount of energy they use. Heat pumps reverse the natural flow of heat using the refrigeration cycle, pumping heat from the outdoors to the indoors during the cooler seasons, and from the indoors to the outdoors during the warmer times.
All heat pumps use a refrigerant, a fluid that vaporizes at low temperatures, to move the heat.
The refrigerant begins at a temperature colder than the outdoor air, and is warmed by a coil, which absorbs heat from the air and transfers it to the cold refrigerant. The refrigerant vaporizes due to the added heat, and though it is now a gas, it is still too cool to warm the house. At this point the refrigerant-gas enters a compressor, which heats the gas by adding pressure. The compressor then forces the hot refrigerant-gas into the indoor coil, where the refrigerant releases its heat into the indoor air. To spread the heat throughout the house, a fan is installed to blow the warm air.