Ideally a bi-directional through-wall vent + fan would be great with built in thermostats measuring both sides.
I haven't found that nor am I entirely sure what to search for. Are there components that I could buy that provide this functionality?
Edit:
So all fans AFAIK are bi-directional components. The issue is the controller and I don't care about controlling speed as much as the direction + on/off.
One solution I have in mind is something like this:
[through-wall fan/vent system] -> [some sort of inline polarity switcher] -> [wall plugin thermostat controlled relay]
The issue is the polarity switcher. A manual polarity switch would be fine since I'd only maybe need to change it seasonally for the most part. What can I look for that does that?
PS: I am not looking to cut anymore than a single whole in the wall (and no more than 4-9" diameter) and simple set up is a plus. Long term I may loop back and do a custom job with an arduino but for now I'm looking for cheap, easy & off-the-shelf.
Best Answer
Simply exchanging the air between the rooms will equalize the temperatures because the air will mix. I would just cut two vents in the wall, one high and one low. Natural airflow probably won't be enough to balance the temperature, so put a fan in one or both of the vents. If you do both, point the fans in opposite directions.
Again, it doesn't really matter which way the air moves because it will mix.