I'm noticing a little mildew on the ceiling in our master bathroom and some of the wallpaper is starting to peel in a couple of places. The problem being that there is no fan in the bathroom to remove the excessive humidity from showering and bathing. There is a fan in the separate little toilet room which I try to run to reduce this, but I think it's useless and I'm not sure that it's even blowing any air at all as it's not connected to a vent, but just open to the attic, and not even really open as there is a sheet of plywood over it...
I was getting ready to have a power vent installed in there that I can run for a short time during and after a shower to remove that humidity but another idea occurs to me
The master bath is directly over the attic where the HVAC unit is that services that part of the house. I write software for the home automation industry so my system knows when the AC is running or not, and even can guess when someone is taking a shower. I was imagining a system where the powervent ran if the heat was on, or if the AC wasn't running, but a system of dampers to instead connect the vent with the return air duct if the AC was on. Letting it get the warm humid air directly and not pulling in hot humid air from outside under doors or wherever by just running the vent. (there is no real makeup air in this house yet, I'm going to address that someday too)
Would it be better to basically have a return air duct in the bathroom to de-humidify in there, keeping in mind that it would only be connected to the return air if the AC was actually running, or would it be better to just run the vent normally. I know that the air in there is likely to be much higher humidity than the outside, at least sometimes, and don't know if the AC can keep up with it. But then, I do live in coastal Georgia, and in another month or so the outside is going to be a lot hotter and more humid than my shower ever gets!
What do you think, interesting idea? or just a hack to be avoided