Temperature inside and outside the model

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I don't think your statement above is true.

You don't have to input any heating or cooling schedule for a given zone if you don't have a system supposed to condition the zone.

What is true is that if you want heating only or cooling only, you still need to input both a heating and a cooling schedule. For example if you want heating at 18°C and no cooling, put a heating thermostat schedule of 18°C and a cooling thermostat schedule of 60°C, thus ensuring you'll never need any cooling.