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The warmup days repeat the first day of the simulation until the building is periodically stable (i.e., the temperatures and heat fluxes at the end of the day align with the beginning). What ever weather conditions and schedules are set for that first day will be used.

If you are simply performing a cool down test, you can use a synthesized weather file and ideal loads to control the environment as you'd like for your test. Hold the environment constant for a period of time and then introduce a step change in either the thermostat setpoint or the outdoor drybulb in the weather file. This should give a pretty controlled way to test the thermal decay.

The warmup days repeat the first day of the simulation until the building is periodically stable (i.e., the temperatures and heat fluxes at the end of the day align with the beginning). What ever weather conditions and schedules are set for that first day will be used.

If you are simply performing a cool down decay test, you can use a synthesized weather file and ideal loads to control the environment as you'd like for your test. Hold the environment constant for a period of time and then introduce a step change in either the thermostat setpoint or the outdoor drybulb in the weather file. This should give a pretty controlled way to test the thermal decay.