Can I install two thermostats to control one furnace?

We set the t/s in the living area to 65 F at night and close down the only adjustable heating vent, which we have in the bedroom, almost all the way at night. That way the Living area gets heated up and the bedroom stays cool. In the morning we set the t/s up to 68 F. The vent can be adjusted to change the bedroom temperature at any time.
We also frequently have an electric heater in the living area to help maintain the temperature without using propane.
This is way simpler than trying to hook up two t/s.