Kara Zorn on April 30, 2014 19 Comments If you think a portable air conditioner isn’t for you because you have crank or casement windows, you may be pleasantly surprised to discover that not only is it possible, but it’s easy to do. Although most portable air conditioners come with a traditional window kit, you can absolutely fabricate an insert to fit into the casement window allowing you to vent your portable air conditioner. We recommend using Plexiglas; however any type of material that will keep the hot air out and the cold air in will work. Step 1 First measure the window in order to know what size Plexiglas insert you’ll need. You can have a piece of Plexiglas cut at your local hardware store. You’ll also need a hole cut in the Plexiglas for your vent hose. It’s best to bring the vent hose with you so they can cut the hole to fit your hose correctly. Step 2 Once you’ve got your Plexiglas, you can begin the installation process. Open the crank window and firmly attach a latch to the window as well as the frame. Step 3 Next, using retainer clips or twist clamps securely position the insert into the window frame. You”ll then need to caulk where the casing and window frame meet in order to seal the insert and keep it waterproof. A second option would be to run weatherproof stripping where the casing and window frame meet instead of caulk. Step 4 Now that your insert is installed weatherproofed, all that’s left is to attach the hose to your insert and enjoy the cool air.