Hmm I'm assuming the 3 line idea is to be able to hear or cool in different zones at the same time? I wasn't planning on doing that. It would be strictly a heating or cooling mode.
That being said I've been starting to play with a raspberry pi and learning Python. I just found out yesterday that the have a pi zero that cost 5$. So that got me thinking about a great way to control each room. Obviously each room would need its own temp sensor and fan. Currently I'm looking into the best way to control a fans speed and find an efficient transformer. Or possible just run a 120v fan with triac.
But the thought would be to have a small desktop touch screen that holds the pi zero and a sensor that would attach to something that was similar to a radiator on a wall but much more pleasing to the eye.
https://www.ijirset.com/upload/2015/...7_40_Speed.pdf