400CM (157)Universal Window Seal for Portable Air Conditioner And Tumble Dryer – Works with Every Mobile Air-Conditioning, Easy to Install - Air Exchange Guards With Zip and Adhesive Fastener

The velcro will leave a residue that is very difficult to remove. The screen does not keep temperature well and it gets very bright/hot when the sun hits it.

I have regular, sliding windows. But the windows are tall. The window kit that came with my portable Frigidaire a/c wasnt tall enough to cover the entire window opening. After looking and looking, I nearly gave up and was about to spend hundreds of dollars to ask a professional to come solve this for me. And then I found this product. Decided to try it given the 5-star reviews and low price, and voila! It worked better than the standard window kit. Its now been a week, and my a/c is working exceptionally well. The cloth is plastic, and is air-tight. Fits nearly any kind of window. Buy this before you lose hope on how to install your window kit for your a/c. Installation time for me took a little longer than most (~30 mins), since the shape of this is not a rectangle, but my window opening was (regular sliding window). I just let the cloth hang a bit where there was extra. Worked out fine and the seal is still holding. Would HIGHLY reocmmend

Ill start off by saying I am very happy with the way this product has been performing. We have casement windows so ended up purchasing some portable air conditioners and using these window seals to make sure they didnt have to work overly hard to cool the room. So far so good. I am impressed at what a good job theyre doing. However, these are not as easy to install the first time as they make it seem. On their own website they say Install it in just seconds and that is simply not possible. I had to email back and forth with customer service a number of times even after having watched their demonstration videos. Once I got it down the first time, though, the second time WAS a lot easier. Just dont think youre going to be able to unpack this and get it set up quickly without some help.

Purchased this because I have an odd shaped window that cranks open. There were few options for installing an air conditioner in this hot room (despite central air), so I purchased a floor model. This seems to be the easiest option for installation. I looked at the directions, its fairly common sense. Stick on the Velcro and then attach it. It attaches fine. The vinyl is thin and flaps in the breeze if you dont get it tight enough. It definitely doesnt come together like the picture unless you have a degree in engineering. It works fine and really that is all I needed. My daughter has not complained once, that in itself is a miracle. The room gets cold and I can close the window when the AC is not in use. So, 4 stars because it saved me from replacing the window for another year and it works!

Product works as expected. I have a vertical window that cranks outward w a lever window latch/lock. The Velcro was easy to install and clip/work around window hardware. Velcro is sturdy and holds in place really well. For my style of window there is too much fabric to close the window and latch it closed 100% so I take the insert down each night and put it back up in about 15 seconds each morning. The double zipper is nice but seem extra at least for my style AC unit. Would buy again for a quick and inexpensive solution for portable ACs

Highly recommend the suppliers are super nice and easy to work with even offer help if needed. Comes with everything you need super easy to figure out.

This does as advertised. I can move between bedroom and another room happy with purchase. Bought extra vector to cover 2 windows yes it doesnt seal perfect but does a great job lolike the option if moving unit if needed. Kind of pain moving windows closure will by 2nd one so I just need to move unit keeps my room cool at night so very happy with purchase and still get sunlight in through window.

Our central air went out in our apartment in Nevada in July. We have to wait two weeks for the replacement part so the repair person brought up a portable unit and used duct tape and a trash bag (I’m not kidding - see the picture) to affix the hose to the window. It lasted approximately 12 minutes before the heat of the unit got so hot that the adhesive on the tape melted, causing extremely hot air to then blow BACK into our apartment. At 3am, it was 90°. In a late night internet search, while sweating and crying, I stumbled across this GEM on amazon. It was delivered in less than two days and installed within minutes. You can see that the windows we have are weird - almost like a reverse awning. So I wasn’t sure if it would work. But the 300CM was PERFECT on the larger window. This has saved me (and my marriage) - can’t recommend enough.

Even ordering the wrong product. I was able to adapt it to fit my window. Have only used 1 day and works fine. Company emailed me next day. Very pleased

I was so excited to receive this as our bedroom gets hot and we have a crank window. It was okay to install, didn’t give a tight seal because of how are window was idk? It lasted a good month before it fell down, in ND, it gets hot AF, and humid, the stickiness of the Velcro came off and I gave up