Two of the three inserts were easy to install and prevented frost from forming on the outside glass. The third one was difficult to install because it is was cut too large by about 1/8". It took extra hard pushing and smushing the rubber cushions to the max. As a result, leaks allowed frost to build up on the exterior glass window. So, I tucked in rope window caulk around its perimeter. It helped a bit, but the Indow is bowed due to being oversized.
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