Photocells turn lights on and off in response to natural light levels - for example, on at dusk and off at dawn.
Crank timers, which are spring-driven and similar to old oven timers, limit lights to short durations where the need for light is brief.
Occupancy sensors activate lights when you enter a room and turn them off after you leave. They are good for areas of infrequent use, such as storerooms.
Dimmers reduce the wattage and output of light bulbs. They also significantly increase the life of incandescent bulbs.
Don't overuse kitchen and bathroom ventilation fans. Left on for too long, these fans can pull out much of your heated air.
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