Hi Guys, I am so new to building Energy simulation.So Sorry If i am asking a stupid question. I am analyzing a building Energy need regarding its geometry and Envelope in open studio....In this case I have used the ideal air load oprion for my conditioned spaces. For calculating the heating and cooling load, should I contain design days in my model or not? As i have read, design days are important for HVAC sizing simulation...So as I have not this aim and in Ideal air load mode , Is it necessary to define design day in the model? Thanks