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?
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.