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[EnergyPlus_Support] Indoor air temperature LOWER than ambient temperature



Hi 

I've been doing E+ simulation for over half a year now and feel like I have a good grasp of it. But one thing I can't figure out is why I sometimes get results of indoor temperature being lower than ambient temperature. This often occurs during the early morning, 3am-9am. In reality this is impossible so I'm very confused by this result. 

Can someone please explain to me why E+ produces this result? 

If requested, I can attach additional information such as .idf or excel graph.

Many thanks,

Ryan



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