I would like to add a second, remote thermostat to my exiting HVAC system so that I can choose which area of the house will control the heating/cooling. I think I can do this by placing a simple on/off switch into the wiring to the remote thermostat. When 'off' the main thermostat will remain unaware of its remote partner and will function as a stand alone device. When 'on' the main thermostat will defer to the signal from the remote thermostat.
The main thermostat is a Honeywell Visionary TH88320U1008 which has connections for a remote thermostat.
Will this work as I intend?