I have four bathroom exhaust fans throughout the house and in this area the temperature/humidity outside can easily swing 40 points in a day. I have an accurate outdoor air and humidity sensor installed outside my garage that’s fed into SmartThings (Bringing in Analog Sensors & Misc Items to SmartThings using ST_Anything - My Writeup). I would like the ability to turn on and off my exhaust fans in the morning (and potentially late afternoons) based on indoor temperature, outdoor temp/humidity, and current thermostat mode (cooling). In other words I want to pre-cool the house for the cost of running some exhaust fans instead of later running AC. I also want to be able to auto turn on our master bedroom exhaust when the humidity is high (I have a temp/humidity sensor in the space).
Is there any technical reason (bad for fans, etc) that I can’t use a GE fan control switch on the bathroom exhaust fans and run them at a lower speed in this mode? I would think since the fan controls are made to run ceiling fans at low speed without burning them up it would work the same for bathroom exhausts. I have found multiple bathroom exhaust speed controllers that do the same type of thing so I would imagine it’s possible (https://www.amazon.com/NuTone-57W-Variable-Control-Ventilation/dp/B004Q01PQI, www.homedepot.com/p/Broan-Electronic-Variable-Speed-Fan-Control-in-White-57W/202905912, etc).