Portable AC Window Seal Kit 400CM (157") – Universal No-Drill Window Vent for Casement, Crank & Skylight Windows – Adjustable Zipper Seal for Single or Dual Hose Portable Air Conditioners

Held up in full sun for entire summer. If you shut off your ac when it is humid, the adhesive may release on one side. We found that reinforcing with weather seal tape addressed the issue. It gives enough extra that you can easily fit it in a window. I recommend installing from top to bottom and on the straightest part of your window first. It is not hard to install, but it depends on your ability to peel carefully and how well you have cleaned and prepared the area. It did a good job of keeping the heat out, but I recommend also purchasing an insulating sleeve for the AC unit inside to get the full benefit. It is the same thickness aso one of those stuff in a tiny pouch windbreakers. So it's thin, but does what it needs to do. Good value for the money.

Not easy to figure out how to use an ac unit in a window like this! We have an old house so these crank completely out. So both sides need to be sealed. It wasn’t difficult to install, just use the adhesive to apply all around the window frame and then velcro the plastic pieces together. It doesn’t look the most attractive from the outside but it’s better than dying of heat! There’s normally No leakage but if there is a heavy rain, the way it seals together on the top of the window creates a pocket… so it will start to get filled with water and can leak down the sides a bit. How to solve that is to raise it up making a pitch in the plastic so it drains off the sides so it won’t collect there. The zipper opens large enough to attach the hose through. It really is the best solution for this weird type of window. Ok, the only one! Haha

the velcro strips got unglued as the window was in the full sun. Resorted to duct tape to stop the daily gapping. Too late to return. Bought Martinson's plexiglass insert - expensive but does the trick

This literally makes it possible for me to run an AC in my weird apartment. Dunno what I'd do without it. I'm cozy now thanks to this thing.

Works well for ourward swinging casement window. The window can still close if the hose it removed without removing the material which makes it easy to sut up foe the next use. Would be better if the material were a bit thicker for better insulation. Zipper alos seems a bit cheap and hopefully will not break after a short time.