If condensation appears on the storm window glass instead of the interior glass, it is a sign that the inner window is poorly sealed and warm air is leaking through to contact the colder surface ...

Interior window trim is often more decorative so wood is a viable choice. Window trim will work as an important barrier to help keep outside air out of the home, and inside air in, says DiMartino.

To make the most of your makeover, we turned to interior designers for their expert insights on the top window treatment trends for 2025—and how to make them work in your space.