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After all this time, I would like to discuss the requirement mentioned in the title. The requrement is in ASHRAE90.1 AppendixG Table G3.1.

1. Why do we have to simulate both heating and cooling even if no heating or cooling system is to be installed?
2. For buildings without heating system in tropical climate, normally I use ThermostatSetpoint:DualSetpoint, but I set the Heating Setpoint Temperature Schedule very low such as -100ºC. Is this the correct approach to comply with this requiremnt?

Answers to only one of the two questions are also appreciated.

After all this time, I would like to discuss the requirement mentioned in the title. The requrement is in ASHRAE90.1 AppendixG Table G3.1.

1. Why do we have to simulate both heating and cooling even if no heating or cooling system is to be installed?
2. For buildings without heating system in tropical climate, normally I use ThermostatSetpoint:DualSetpoint, but I set the Heating Setpoint Temperature Schedule very low such as -100ºC. Is this the correct approach to comply with this requiremnt?

Answers to only one of the two questions are also appreciated.