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Exterior storms vs. interior inserts for older windows
How do exterior storm windows compare with interior window inserts for reducing winter heat loss through older windows? Both seem like ways to add another layer without replacing the existing window, but I’m unsure how much the choice depends on air leakage, the condition of the window, or how the extra layer affects condensation.
I can see exterior storms being awkward where outside access is limited, while an interior insert might cover historic trim that’s worth keeping visible. What differences have you found in insulation and draft reduction, and what ventilation or moisture precautions matter for each setup?
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The existing window’s condition matters: an added layer may reduce drafts, but it won’t repair a leaky sash or frame. With a sound, reasonably airtight window, access and whether you want the historic trim visible may weigh more heavily, along with where the added layer shifts condensation risk.