why energyplus gives me constant temperatures all day long in thermal simulation.

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Rasha, can you give us more information on the following so we can help you better:

1. The input file used.
2. Weather file used, if any?
3. Version of Energyplus used.

Weather file used = meteonorme .epw Version of Energyplus used = v 9.3

@rasha are these constant indoor temperatures or outdoor temperatures? You should be able to add images to your post to help explain your question.

indoor temperatures