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Hi Julian,

I have problem for calculating heating and cooling load. I am using AFN for natural ventilation and my model does not have an HVAC system. I have read the inputOutput Reference for EP. It says "the Ideal Loads Air System is usually the sole conditioning component: the user does not need to specify air loops, water loops, etc. All that is needed for the ideal system are zone controls, zone equipment configurations, and the ideal loads system component." I tried adding different objects, but either I got the "severe" error and the simulation terminated Or I had some warnings and it did not calculate the loads. Can you please list all the objects I need to successfully calculate heating and cooling load? Your help is much appreciated. Sam