Most homes, apartments, and offices have small exhaust fans in the bathrooms and potentially the kitchens. These small fans are designed to operate for a short time to remove odors or humidity from a room and exhaust to the outdoors. When the fan operates, it pulls air from the room, creating negative air pressure. Air from other parts of the building or from the outdoors will move into the room to replace the air that was removed. Most of the time, this replacement air comes from the outdoors. Even though the fan is small, a kitchen or bathroom exhaust fan can remove a lot of heated or cooled air from a home or office. Unless the outdoor temperature is the same temperature as the indoor air, the replacement air from the outdoors must be heated or cooled. This means that the exhaust fan contributes to energy use in two ways: to operate the fan itself and to heat or cool the replacement air. It’s easy to forget and let the fan run longer than needed. Some ideas to consider:
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May 2024
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