I'm pretty excited about this switchplate with built in temperature and humidity sensors that I bought for my parents' bathroom. They had been having a problem with moisture from showers staying around too long, so I had them buy a new exhaust fan that actually exhausts the CFM that it's supposed to. Although the relative humidity sensor doesn't automatically control the fan, knowing the relative humidity can help you decide if you should manually run the fan for longer. For example, if the RH is 40% or higher and it is cold outside, you will probably get condensation on the inside of the exterior wall[1]. The separate 3-way switch is also pretty cool: pushing it down makes the fan run for a preset amount of time, like 30 minutes, without requiring the bathroom light be on. Both the switch and the switchplate are available from EFI.
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