How to Install a Casement Window AC: A Step-by-Step Guide

Air conditioning is a must-have during those hot summer months, and for those with casement windows, finding the right solution can be a challenge. Casement window air conditioners are designed specifically for this type of window, and in this blog post, we will guide you through the process of installing one. With our step-by-step instructions, you'll have your casement window AC up and running in no time.

Step 1: Choose the Right Casement Window AC Unit

Before you begin the installation process, it's essential to select the right air conditioning unit for your needs. Measure the dimensions of your casement window and take note of the height, width, and depth. When shopping for a casement window AC unit, make sure it fits within these measurements. Additionally, consider the cooling capacity (measured in BTUs) to ensure it can effectively cool the room.

Step 2: Gather Your Tools and Materials

To install a casement window AC unit, you'll need the following tools and materials:

Measuring tape



Drill with various bits

Window bracket or support


Foam insulation

Plexiglass or plywood (optional)

Step 3: Prepare the Window

First, open your casement window and remove the screen. Clean the window frame and sill to ensure a secure fit for the air conditioner. If your window has a crank handle, you may need to remove it to create enough space for the AC unit.

Step 4: Install the Window Bracket or Support

To provide stability for your casement window AC unit, you'll need to install a window bracket or support. Follow the manufacturer's instructions to secure the bracket to the window frame. Make sure the bracket is level and can support the weight of the air conditioner.

Step 5: Position the AC Unit

With the window bracket in place, carefully lift the air conditioner and position it on the bracket. Make sure the unit is level and secure. If your AC unit comes with a window filler kit, install it according to the manufacturer's instructions.

Step 6: Seal the Window

To prevent air leaks and improve energy efficiency, it's crucial to seal the gaps around your casement window AC unit. Apply weatherstripping to the window frame and the edges of the air conditioner. For larger gaps, use foam insulation to fill in the spaces.

Step 7: Secure the AC Unit

Once the air conditioner is in place and the window is sealed, secure the unit to the window frame using screws or brackets provided by the manufacturer. This will ensure the unit stays in place and operates safely.

Step 8: Fill the Open Window Space (Optional)

If there is still open space above or beside the air conditioner, you may want to fill it with plexiglass or plywood. Measure the dimensions of the open space and cut the material to fit. Secure the material to the window frame using screws or adhesive.

Step 9: Plug in and Test the AC Unit

With the casement window AC unit securely installed, plug it into a nearby electrical outlet and turn it on. Test the unit's various settings to ensure it's working correctly and efficiently cooling the room.

Step 10: Enjoy Your Cool and Comfortable Space

Now that your casement window AC unit is installed and functioning properly, you can enjoy a cool and comfortable living space during those hot summer months. Regular maintenance, such as cleaning the filter and checking for air leaks, will help keep your air conditioner running efficiently and extend its lifespan.

By following these steps, you can successfully install a casement window AC unit in your home. With the right tools, materials, and a bit of patience, you'll be on your way to a cooler and more comfortable living space in no time.

Casement Window


Casement windows are the most common style of window. They feature hinged panels that swing open and closed. Casement windows are available in single panels or multiple panels. The direction a door swings, either to the right or the left, is called the handing. In addition to handing, window are identified as either inswing or outswing depending on whether they open into the house or towards the outside.


Our team of experts will work with you to develop a bespoke plan that fits your needs. We take a holistic approach to the planning process, combining our technical expertise with our knowledge of customer requirements and project constraints.


Freedom to dream "truly custom-made"

Doorwin provides one-stop solution for professional windows doors manufacturer and installation. We have been serving customers with our high quality and branded products in United States, Asia and worldwide.


This newly built private house is in Sydney, Australia. The area occupied by the fenestration system in our scheduled design drawings was up to more than 110 square meters. A wide range of design details made the perfect mix of modern aesthetics and traditional sophistication, the simulated vertical hung windows with tilt & turn opening systems in this home are absolutely breathtaking. SDLS (Simulated Divided Lites with Spacer Bar) brings some historical vintage feeling to the whole building without losing any energy saving performance. Long narrow fixed windows creating larger-than-life expenses, coupled with German high-end systems made this project stand out from the rest.

Simulated Hung Window with Tilt & Turn Openings

The client's idea was to maintain a certain vintage feel, and our aim was to meet the energy efficiency needs and standards of modern houses as much as possible while maintaining a retro design. Doorwin’s 61S simulated hung windows with tilt & turn openings is a respectful modernization of a classic architectural masterwork.

Why choose the tilt and turn opening method?

Because it generally has better air seals than sliding, single hung, or double hung window frames. Tilt and turn windows form a complete seal when fully closed, this means they are less prone to water leakage, and cold draughts and you’ll keep more of your heating indoors where it belongs. They can be opened in the upper tilt way to ventilate at a minimum opening status and are easy to clean outside of the glass; when there’s a good day, they can be opened as normal inward casement windows.

Large Energy Efficient Fixed Windows

Our well-crafted bespoke systems enhance the functionality and panoramic view of this modern house.

Huge, fixed glass walls up to seven meters long and two meters high bring great lighting and open views, making it really refreshing to the mind. Five meters high long narrow windows give the whole building a contemporary aesthetic.

Every window’s placement and shape not only add to the uniqueness of this home but also provide a more energy-saving ability for the owners.

Doorwin energy-efficient integrated glazing units feature double-pane glass, warm-edge spacers, argon gas fill, Low-E coatings, and fully tempered glass, they can not only create a comfortable and natural indoor environment but also save electricity bills and heating bills of more than 100 USD for the owner, it’s a real bargain compared to choosing a regular glazing set.

Custom Designed Thermal Break Aluminum Entry Door

Aluminum Door offered an air of uniqueness and elegance to a home. With their luxurious patterns and beautiful finishes, it provides this house with a bounty of aesthetics and security. Aluminum entry doors allow you to resist any weather extremes, corrosion, and pests. So aluminum is one of the most resilient and durable materials you can select for front doors considering the price/performance ratio.

With pieces of double panes, and Low-E tempered glass. The door provides a good insulation performance.

Custom Designed Grilles and Transom

Divided lite windows and doors offer unique architectural solutions for buildings without compromising energy efficiency or aesthetics. Doorwin provides multiple muntin and glass options to customize your divided lite windows and doors. Further customization is available with a variety of colors and materials, creating an infinite number of design combinations to best suit your style.

In this project, we use SDLS (simulated divided lites with spacer bars), these bars permanently adhere to both sides of the glass, and spacer bars are installed between the glass, this is the most energy-efficient way to create the look of classical décor grilles. The windows in the bathroom bedroom and study have an Arch Transom Design, making these rooms, which are often used by the owner, have some traditional aesthetics.

BTW, Doorwin offers free design assistance, so if you need a custom design like this one, contact us right away and we will provide you with the most aesthetically and functionally pleasing design solution.

German Imported Hardware System

For windows and doors, hardware is as important as the engine is to the car. The continuous technological innovation of the European hardware industry has strongly promoted the performance improvement and functional innovation of windows and doors. In this project, Doorwin uses Hoppe™ multi-point locks, hinges, and handles from Germany.

Multi-point lock systems provide not only the burglar-resistance but also a tighter compression seam, making the window keeps good energy-efficient performance. Together with Technoform Bautec’s insulation edge bond and sealant strips, these make up our products' top insulation and energy-saving performance.

Save Your Money On Installation Costs

We have several international patents to reduce clients’ labor costs, such as our unique flanges and assembly type tubular design, which is different from the other products on the market. What sets us apart among Chinese counterpart is that all our products are equipped with nail fin structures for quick and easy installation. Labor costs during installation may exceed of the window and door price, therefore, our exclusive patent allows users to not only get a significant increase in installation efficiency, but also greatly reduce the labor cost of window and door installation. A cost that may bring you unexpected savings that far exceed the price difference you may care about now.

Free Design Assistance

With our own expertise, we provided the no-cost design development and contract documentation with CAD & BIM drawings, including elevation, details about the project, and installation help.

Before production, we will provide accurate sample drawings, which will clearly show the cross-sectional pattern, size, opening method and direction, pattern of the warm spacer, and the installation nodes. We will not go into production until you have signed off on the drawing to ensure that you receive a final product that meets the exact requirements of your project.

About Doorwin

Doorwin's professional packing system guarantees all products are delivered safely and without any damage. We apply a four-point packing system. Firstly, adhesive plastic film is applied on interior wood frames and exterior aluminum frames to avoid scratches on the surface. Then, a paper board is applied after we apply air bubble film surrounding the whole windows/ doors to avoid any destruction or clash. Lastly, we place them into a durable non-fumigation plywood crate to avoid any possible damage during transportation.

With years of experience shipping our products worldwide, we could guarantee to ship our products to their final destinations intact and without any damage.

About Doorwin Factories

Doorwin is one of the most professional window & door manufacturers are known for its great customized products. In Doorwin, a variety of colors, styles, and sizes of products are available to meet the client’s unique requirements. We own three ISO9000-certified modern factories in China. With a factory area of 20,000 m2 and a production capacity of 100,000 m2 per year. Doorwin Group has the scale to ensure timely delivery and the flexibility to reduce manufacturing lead times to as short as 18 days.