Zone Heat balance

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Hello i am trying to do a heat balance of the thermal zone, i want calculate the gain or loss (of the air in the thermal zone) from walls, windows, roof, floors and internal gains to comparate them. I was Thinking use just ''Surface Inside Face Convection Heat Gain Rate''. But i read in a coment that "Surface Average Face Conduction Heat Transfer Rate" should be used. I thougth that heat tranference to the air in the zone was only for convection. I am comfused, can you explain me please. I am new in this topic. I will be gratefull