All,
I have a corn stove that is heating the upstairs of my ranch home. I have closed all of the registers upstairs as I don't need heat up there. I would like to connect a thermostat in the basement to heat the basement when we are down there. But also would like the upstairs thermostat to work in case we run out of corn or whatever. We do have ac also. Is this possible?

You need to get a experanced HVAC tech to install a zone system