Shipping & Returns Policy | Martinson Manufacturing

We are closed for the winter. Place your order now to be the first in line when we reopen production in April 2027.

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.