A bath fan can save
energy or waste it, depending on how long you let it run after a steamy shower.
If you don't let it run long enough, a lot of humidity is left in the air, and
that forces your air conditioning system to work much harder. If you leave it
on too long, the fan is needlessly pumping heated or cooled air outside while
drawing in outside air—that, too, makes your HVAC system work harder.
The best solution to
both problems is to replace your fan switch with a humidistat switch. By
sensing the humidity level, the switch will run the fan as long as needed but
no longer. Humidistat switches start at about $50. If that's more than you're
willing to spend, consider a timer switch, which costs about half as much.
Either way, installing a dewstop fan switch is no more difficult than replacing a standard light
— Gary Wentz, Senior Editor
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