I'm reading this as the OP wants to have two thermostats attached to one furnace.
Oh, I see what you mean... you might be right about that.
In that case it won't work. You will be forever fighting it and trying to figure out which thermostat is in control and what one you have to adjust to change the temperature because they won't communicate between each other.
You will want to get a thermostat that can accept a remote sensor to either average the two temperatures that you are measuring (thermostat and remote sensor temps) or use it to control the temperature from the remote location.
Almost any pro series digital Honeywell thermostat should be able to do this and let you select if you want to use the remote temp as an averaging sensor or a controlling sensor.
I've had great feedback from the T6 series thermostats but I personally prefer the Pro8000 series (or above) touch screen thermostats.
You can't go wrong with Honeywell however you should know that you may not have this functionality if you buy it from a big box store. Those thermostats are made to look the same as the ones professionals buy from the proper suppliers but have very limited functionality. When we come across them we know they are from a box store because their model number on the thermostat starts with an "R" instead of a "TH".
If you have an option to hard wire the remote sensor to the thermostat then I suggest you do that. If that option isn't there to hard wire it then you can use the wireless ones.
If you get a wifi capable thermostat then you can also adjust the temp from your phone if that helps you any.