Question-and-Answer Resource for the Building Energy Modeling Community
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You could also define this as a window construction assembly. For example, if the original or old window is single-pane, and the new window is double-pane, then you could define the final window assembly as (ordered from outermost to innermost layers):
If you want to explore the impact of installing the new double-pane window on the inside rather than the outside, then the layers of the construction above would be switched.
