Can you have two thermostats on one furnace?

Answer 1

Yes, but if it is not zoned, you will just overheat the area with the other thermostat.

Which ever thermostat is in a cooler area will make the warm area of the house warmer

then you want it.

If you have adjustable vents, just close down the vents in the warmer part of the house or where the thermostat is, and the cooler parts will get more heat because it will run longer to make the thermostat reach temp.

Don't close them all the way, just start at half and see if this works, adj as you need

or until you get the results you want. If they are not adj, you can either get them or

be creative to block some of the heat coming out.

I also believe you would have a duel stage furnace also.