Install Air Conditioner in Old Fashioned Casement Window

How to Install a Casement Window Air Conditioner

Don't suffer in the heat with creepo out windows! These simple, rental friendly solutions will let you to take a casement window air conditioner this summertime!

How to Install a Casement Window Air Conditioner

Our upstairs rooms have casement windows (also known as crank out windows), making an in-window air conditioner impossible to install. We avoided going upstairs altogether on the hottest days! But I've found three simple ways to set up a casement window air conditioner, to keep our upstairs cool all summer long!

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Central air-conditioning is pretty rare in Seattle, since our summers are usually 75 degrees with low humidity (to make up for those dreary, rainy winters!) Simply the last few summers accept been creeping into uncomfortable territory, and when you add together in wildfire fume that forces our windows closed, it becomes unbearable!

smokey Seattle skyline
This was our view of Seattle during the worst of the wildfire smoke in 2018!

Our upstairs is but the playroom and the guest room, and so nigh of the time we but avoid going upward in that location when it gets as well hot. Just with family coming to visit this summertime, I started searching for a manner to install a vertical window air conditioner to make our guests more comfortable.

What is a Casement Window?

A casement window is a window that operates on a hinge, instead of sliding on a sash. My window cranks outward, which is nice for catching the breeze simply doesn't help when the air is even so and hot.

casement window

Supposedly, casement windows are more than energy efficient and are more soundproof than sliding windows. Just I'one thousand not a fan of the design, and plan to switch them out if we always remodel the upstairs.

Portable Air Conditioners

Portable air conditioners accept dropped in price significantly since they first came on the market. At present they're comparable to window units, and way more than versatile. I nabbed one of the few left in the store simply before our heat wave started!

portable air conditioner unit

Instead of mounting the entire unit in the window, a portable air conditioner rests on the floor and uses a vent pointed exterior. Information technology's easy to remove the vent when the weather cools down, so you tin open the window instead. Unfortunately, the vent brackets won't work with a casement window! 🙁

portable air conditioner vent bracket

I needed a fashion to block out the hot air (and bugs) exterior while nevertheless allowing for venting for the air conditioner. After some research, hither are a few skillful options for how to put a portable air conditioner in a creepo window.

Plexiglass Casement Window Air Conditioner

This was my first idea, and it turns out I'm not the simply ane who thought of this option! I was debating screwing the Plexiglass direct to the window frame, but this video shows how one homeowner replaced his window screen with a custom made Plexiglass insert instead.

This is a great long-term solution, and one that I will probably practice at some signal in one case I figure out all the parts. But with the heat wave imminent, I needed something quick and piece of cake!

The downsides to this method are that large acrylic sheets are expensive, and it's difficult to cut a perfect hole for the exhaust vent without cracking. Bank check out my tips and tricks for cutting Plexiglass if you decide to go this road.

I likewise had a difficult time finding a screen frame that would fit in our windows, and I didn't want to drill permanent holes in our window frame either.

Foam or Plywood Window Insert

This method uses the window vent insert that comes with the portable air conditioner, coupled with a piece of rigid cream or plywood to cake the rest of the window. This would also work if you lot want to install an air conditioner in a sliding window as well. Y'all can encounter how i homeowner did information technology in the video below.

This is a fairly cheap and easy solution, just also has its own drawbacks. We simply take one window in this room, so blocking off all the sunlight isn't actually an choice. Plus, a strong gust of current of air would knock a foam insert correct out! Plywood would crave multiple screws to be drilled straight into the window frame.

Fabric Window Seal for Portable Air Conditioners

I stumbled upon this cloth window seal kit on Amazon, and information technology was cheap enough that I decided to give it a endeavor. This is definitely the virtually renter friendly option, and a temporary solution that we'll employ while I puzzle out the Plexiglass version above.

This casement window air conditioner installation kit comes with a triangular piece of fabric with a zipper down the eye and Velcro along the edges. You also become a roll of adhesive Velcro and large naught ties.

casement window air conditioner fabric window seal kit

How to Install the Textile Window Seal

The instructions weren't exactly clear, so I thought I would do a quick tutorial on how I installed the cloth window seal. I repent in advance for the horrible photos. Taking pictures of a window on a sunny day is difficult!

Our window frame was filthy, so I removed the screen and gave the entire thing a good cleaning. This volition aid the agglutinative Velcro stick amend.

cleaning window frame before installing casement window air conditioner

Apply the Velcro to the window (the function that moves) and the window frame (the part that holds the window in place when airtight).

applying adhesive velcro to window frame for casement window air conditioner seal

Find the widest signal of the cloth, and attach the narrow side to the moving window frame where it opens. Make sure the zippers will be on the inside where you tin actually use them!

fabric window seal for casement window air conditioner

Piece of work your style effectually the frame, folding the textile at the corners to make a ninety degree turn. I had a little extra fabric at the ends, merely I just tucked them exterior.

attaching casement window air conditioner seal to window frame with velcro

Apply the other side of the fabric the same way to the non-moving function of the window.

window seal with zippers in casement window for air conditioner

And so just creepo out the window, open the zipper and stick out the vent. I tried to wedge mine between the window and the exterior trim then it wouldn't motion.

portable air conditioner vent through casement window seal hole

And then close the zipper around the vent, and thread the zilch tie through the pull. This keeps the zipper from opening and letting in those pesky bugs!

casement window air conditioner vent zip tied to fabric seal

Information technology's certainly not the about attractive choice, but information technology works! When the weather cools down, I can remove the fabric and put the screen back in about 15 seconds. 🙂 The casement window can nonetheless open and close normally, so I can exit the Velcro in place until nosotros need to apply the fabric seal again.

casement window air conditioner with fabric window seal

Now that we have a casement window air conditioner solution in place, nosotros tin go upstairs on those hot summertime days, and our guests will be and so much more comfortable!


Check out these other like shooting fish in a barrel domicile comeback projects!

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