Choose between 2 climate entities

I got 2 climate entities. 1 main; for the whole house and a 2nd for just the 1st floor. Now I’m trying to set up the when the heater starts AH will choose which heater to use depending on the whole house or only the 1st floor.
What I don’t get figured out is how to make a thermostat that chooses which heater to use.

Don’t make a thermostat to control your two thermostats, make an automation.

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