I could see using this for my basement in a future revision. I only have one dehumidifier down there but I probably have to add a second. The dehumidifiers can of course switch on/off automatically based on humidity, but I could use these products to control them by time of day as well. That way, the humidifier(s) would run when electricity is cheap, unless the humidity gets too high, in which case the humidifier(s) should be switched on regardless.
I could also use one with my chickens, come to think of it. When the door's closed and they're stuck inside (at night, in the winter), the air quality in there can get pretty bad. I have a fan, but it's only thermostatically controlled. I was just wishing the other day I that I could have the fan turn on when the air quality got too bad. Once these systems are able to send notifications (iOS 9?), with some "if this then that" type programming they could be really useful.