Question-and-Answer Resource for the Building Energy Modeling Community
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Yes, it is possible. You can do this selecting OtherSideCoefficients in the Outside Boundary Condition field of the BuildingSurface:Detailed object (i.e. the wall or surface) and referencing a SurfaceProperty:OtherSideCoefficients object. That SurfaceProperty:OtherSideCoefficients object can have whatever temperature you like - a constant, or scheduled value. There is more detail in the InputOutput reference guide that comes with the EnergyPlus installation.
Hope this helps.
