Right, so with a variable speed system such as the Carrier Infinity, you need a special zone damper control that's compatible with the system which can variably open and close the zone damper vs just being full open or full closed. In your situation where you are just using it at night, this isn't a concern but the way the system is designed it trys to even out the temperature and if it's zoned then it needs to variably control those zones as well.
I have no idea what these controls cost and the labor to replace your existing control.
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