About
Our Story
Martinson Manufacturing started with a simple problem.
We needed a clean way to vent a machine through a window, but every solution we found looked temporary or poorly designed. So we built our own.
What began as a small exhaust venting solution for laser cutters quickly caught attention. People started asking if we could make one for them too.
Over time that single idea evolved into a line of precision-cut window inserts designed to vent portable equipment cleanly and efficiently.
Today Martinson Manufacturing focuses on creating simple, well-designed venting solutions that actually work.
In 2022, Joe expanded the company by developing custom window vent kits to solve another common exhaust venting problem. The vision was simple: create a one-stop shop for clean, reliable venting solutions.
By 2023, demand for the window inserts had grown so quickly that Martinson Manufacturing shifted its focus entirely to designing and producing custom AC window kits.
Today the company continues refining its designs and manufacturing process to deliver the cleanest fit possible.
The phrase customers use most often in reviews says it best: “perfect fit.”
Joe Martinson
"Since 2019, I've never had a single interest in just selling plastic parts to people. They can get a piece of plastic somewhere else. What I am interested in, however, is designing highly refined, elegant solutions that fit perfect, are easy to use and offer incredible value to the customer."
Fit Guarantee
Production
Casement Window
(Hinged on the side)
Awning or Basement
(Top or bottom hinged)
Single or Double Hung
(Slides up and down)
Sliding Window or Door
(Slides side to side)
How Homeowners Actually Vent Portable AC Units Through Casement Windows
Custom-cut inserts that seal tightly, vent heat outside, and eliminate the gaps and workarounds common with generic kits.
Our Family Team
Joe wears all the hats. This company is his brainchild and he personally looks over every single order before it is cut. He's also the one you saw on YouTube .
Marie is sharp as a tack and has a caregiver heart which makes her excellent at customer service. If you call or email us, she'll most likely be the one you talk to.
Olivia is one of the sweetest souls you'll ever talk to you. She loves people and is very knowledgeable which is why she's also on the customer service team.
Marissa is the one who makes your hose hookup a breeze. She is in charge of manufacturing every single vent variation that we offer. She literally makes thousands of these and assembles every one of them by hand.
Justin is our media guy and does all the pictures and videos for our website and YouTube channel. If there's a video of ours that you don't like, it's his fault :)
Samantha picks up all the pieces and is the one who holds them all together. She does a little bit of everything, but her main job is keeping her husband sane during the summer months.
Your Portable AC Should Cool the Room – Not Fight the Window
Works With Your Portable AC
Compatible with single‑hose, dual‑hose, and hose‑in‑hose portable AC units.
Custom Built for Your Window
Precision inserts available for casement, sliding, awning, and hung windows.
Fast, Simple Installation
Installs in about 5–10 minutes with a secure, non‑permanent fit.
The Casement Window Solution
