Search  for anything...

Soleus Air Sliding Window Kit, Reinforced Aluminum Works Exclusive with the Soleus Over The Sill (Saddle) Air Conditioner (Air Conditioner Not Included)

  • Based on 178 reviews
Condition: New
Checking for the best price...
$149.99 Why this price?

Buy Now, Pay Later


As low as $25.00 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Sunday, Sep 21
Order within 15 hours and 55 minutes
Available payment plans shown during checkout

Features

  • ADJUSTABLE TO SIZE - Suitable for all Soleus Air Exclusive Hybrid Saddle Air Conditioners. Hybrid air conditioner window seal kit for horizontal sliding windows is adjustable and can be customized to fit most horizontal gliding window sizes. It fits horizontal sliding windows (both single and double hung windows) from a minimum height of 23.5 inches to a max height of 43 inches. Easily lock the strong aluminum frame in place with the tightening of the screws.
  • EASY TO INSTALL no drilling or difficult installation process. Just measure the height of your window with the Hybrid AC installed, attach the two panels with the 4 screws to the desired height, install the foam insulation around all four edges, place the panels in the window and enjoy your view outside!
  • KEEP THE VIEW With the Horizontal sliding window kit you can always enjoy the view outside or enjoy the natural light through the high quality plexiglass while still maintaining the high efficiency of the Hybrid AC unit.
  • NO TOOLS REQUIRED- Everything needed for the Horizontal Sliding Window Kit comes in the box as the full kit. No need for extra tools or equipment. Ready for immediate installation.
  • ENERGY EFFICIENT- The window kit will include high quality insulation that will wrap around the full window kit for a tight seal for enhanced energy efficiency.
  • WINDOW KIT LOCK - All window kits now come with a lock included to help reduce the chances of outside intrusion.

Brand: Soleus Air


Special Feature: Energy Efficient


Product Dimensions: 1"D x 19.5"W x 23.75"H


BEE Star Rating: [YES]


Color: White


Voltage: 1.2E+2 Volts


Power Source: Corded Electric


Form Factor: Portable


Model Name: Window Kit


Warranty Type: Limited


Brand Name: ‎Soleus Air


Model Info: ‎WS4-AWK


Item Weight: ‎5.74 pounds


Product Dimensions: ‎1 x 19.5 x 23.75 inches


Item model number: ‎WS4-AWK


Efficiency: ‎Energy Efficiency


Installation Type: ‎Window


Part Number: ‎WS4-AWK


Form Factor: ‎Portable


Special Features: ‎Energy Efficient


Color: ‎White


Voltage: ‎1.2E+2 Volts


Included Components: ‎Glass Window Panels (2), Screw Fasteners (2), Foam Sealer, Rubber Window Sealer (Optional)


Batteries Included?: ‎No


Batteries Required?: ‎No


Date First Available: April 2, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Sep 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Sliding window solution
It’s a decent product! I love it, it doesn’t look ugly, it’s functional. Easy to install.
Reviewed in the United States on June 16, 2025 by Louie Louie

  • Does the job, no frills, can’t find anything else like it
I can’t believe nobody else makes something like this with the prevalence of “split” ACs. Don’t get me wrong, there’s nothing special about this product. It’s two pieces of aluminum frame plexiglass that slide with each other. But they include niceties like two rolls of foam to help seal, and a “lock” to help keep your sliding window secured in a halfway open position. Fits a Midea u shaped 12k BTU unit perfectly. Yes you could build this yourself. But with the price of plexiglass and wood required you’d have to literally value your time at $9/hr or less. ... show more
Reviewed in the United States on May 31, 2025 by beale beale

  • Pricey, but Works Great
Aesthetically pleasing, decent build quality, quite expensive but nothing like it on the market. Unfortunately, my doors and windows are black so the silver aluminum frame is not ideal, but it’s such a thin frame it’s not as noticeable as I thought it would be. Installing is quick and easy, after you get the awful plexiglass film peeled off. It is a HUGE improvement over the plastic filler I was using, for sound pollution and air tightness. I used this with my off-brand Cowsar window AC unit and it took a little finagling, but after a few minutes I came up with a solution and I’m happy with this window insert. ... show more
Reviewed in the United States on July 17, 2025 by K K

  • Well-Made & Sturdy
Ok. This item came nicely boxed to protect it from bending or being damaged in transit. So people complain about the high price, but look what you get in return. Try making an actual window insert yourself that doesn't look ugly and that still emits some natural light above the air conditioner. This window insert is very well made with substantial plexiglass window panes and a clean, well-milled aluminum frame that looks just like a window. I retrofitted mine to a GE air conditioner whose width was just under the width of this frame and I installed in a left/right slider window. That's key cause you don't want to have to add left/right side fillers beyond maybe a 1/2-inch because then you sacrifice home security. If you live in a more public setting, a first floor, or have no other locking mechanisms on windows, this might not be a solution for you. While it looks fantastic, it wouldn't offer iron-clad window security. I love mine. It should last for years. ... show more
Reviewed in the United States on July 22, 2023 by Kat

  • Junk
Do not buy this product! Quit working after 3 months. I got August . Now I am responsible for shipping cost to return product to California. And they will ship one back at my cost. Shipping cost to California is 350.00. So by the time I invest money is shipping I can buy one local. At least if it quits working, I can turn to store! I will never buy a large item from Amazon Prime again! And will never buy another Soleusair product again! ... show more
Reviewed in the United States on June 20, 2025 by Lecia sims

  • Gets the job done
Okay, so it's definitely true that this is WAY too expensive for what it is, but if you're trying to get a window AC unit into your horizontal sliding window, this is probably your easiest option. I know the Frigidaire casement unit is an option, but I've read the install is difficult on those units. Otherwise, you can get the Soleus saddle AC, then go to a hardware store and get plexiglass cut to the exact dimensions of the opening. However, this takes time and it might take trial and error to get it fitted correctly. It's also possible with the retractible design of this to get it situated inside the frame, which you can't do with a single cut piece of plastic. Also, if ever you want to move the unit to a different window, you can't do that. So yeah, it's borderline unconscionable for them to sell this for more than $80, but it IS high quality and easily solves a problem in a way no other product can to my knowledge. Existence is suffering. ... show more
Reviewed in the United States on June 15, 2021 by B. Naas

  • Bought this for a normal ac
honestly it's weird no one else is doing this. This is the best thing you can buy if you have a window ac in a side window instead of a vertical sliding window. It's good for any AC not just the suggested saddle type one. We had been using a tiny ac for 5 years trying with cardboard, foam pack board, and even plywood to keep the heat out and the cool in. All of these solutions required vast amounts of duct tape and tuck in insulation and most of them would warp from the crazy weather we get in the mountains and pull tape off and let heat and bugs in. I can say with certainty after spending a whole summer with this product that putting this in plus some extra ac insulation foam to make a seal and much less duct tape has kept the area much cooler than any previous summer. Plus you can actually look out your window which is a big plus. It's made of plexi-glass not real glass which might be a downer to some but we prefer this. In areas where it snows you still have to put any window ac away or it will break from the extreme temperatures and having this be plexi means it won't break when we store it away in the garage this winter, even if we drop it. ... show more
Reviewed in the United States on September 23, 2024 by Anne H.

  • Window
Looks a lot better than a piece of plywood
Reviewed in the United States on June 30, 2025 by Robert

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...