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⚠️ LAST DAY TO ORDER FOR 2026 IS SEPTEMBER 11. Orders placed by then ship in 5-7 days. After September 11, orders will be shipped when we reopen in April 2027. Order now.
⚠️ LAST DAY TO ORDER FOR 2026 IS SEPTEMBER 11. Orders placed by then ship in 5-7 days. After September 11, orders will be shipped when we reopen in April 2027. Order now.

Customer Reviews for Custom AC Window Inserts

We have so many happy customers that love their custom window inserts!
Check out some of our recent reviews and see our products in use.
Find your perfect window insert for your home!

Martinson Manufacturing designs and produces precision window inserts for portable air conditioners. Built for non-standard windows, each insert is made to exact dimensions and engineered to fit cleanly, install easily, and perform reliably in real homes.

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Our Promise

Every insert we build is
designed to fit your window exactly, install cleanly, and work the way it should. If it doesn’t fit right, we’ll remake it. No workarounds, no damage, no guesswork, just a solution that performs reliably in your home. Every time.

Contact

Martinson Manufacturing
705 Schoenhaar Dr #101
West Bend, WI 53090
262-340-1418
info@martinsonmanufacturing.com
© 2026 Martinson Manufacturing. All rights reserved.
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Trusted by thousands of homeowners who needed a real casement window solution.