Shipping & Returns Policy | Martinson Manufacturing

⚠️ 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.

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For current lead times, please check the red banner at the top of the website.
UPS Ground is free for all US orders (3-5 day delivery).
2nd Day Air is $45. Next Day is $75.
CANADA. Shipping is via UPS for $25 USD and Martinson Manufacturing pays for all your import fees/duties.
Will I get a notification? Yes, confirmation email is sent on day it ships. Tracking #’s take 24-48 hrs to update. (Tracking #'s don't update on weekends).
Multiple inserts will ship together.
International Shipping? Yes. Shipping is calculated at checkout.
Damaged during shipping? Send us an email with pictures of the damage and we'll send you a replacement for free.

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.