10 Best Casement Window Air Conditioner of September 2025

• Specially designed for casement-window or sliding-window installation - installation kit included (Not suitable for standard-window installation)
• 10,000 BTU air conditioner cools a room up to 450 sq. ft. with dehumidification up to 3.4 pints per hour (Uses standard 115V electrical outlet)
• Multi-speed electronic controls with 24-hr. on/off timer and full-function remote control
• Auto cool, Energy Saver mode, Sleep mode, 4-way air direction and washable mesh filter with check filter alert
• Energy Efficiency Ratio (EER): 10.4
• Window height- 21.5 inch minimum / 40 inch maximum. Minimum window width- 15.5 inch

FRIGIDAIRE

• Beat the heat while remaining cool and happy on hot summer days
• With 2344.57 W cooling power, enjoy a blast of cool air throughout your room
• Effectively cools area of up to 350 Sq. ft., this air conditioner is perfect for bedrooms
• Provides enough cooling in your room with 3 fan speeds
• Full-function remote control allows you to precisely control the temperature and fan speed from across the room
• Power source type: Corded Electric
• Mounting type: Casement/Slider

FRIGIDAIRE

• Installs in Horizontal Slider or Casement windows (Does not work for standard double hung windows)
• 450 Sq. Ft. of cooling coverage keeps your bedroom or office cool
• 3 fan speeds give you control on the amount of cooling in your home
• 4-way air direction control allows you to direct the air where you want it
• Energy Saver mode conserves energy and lowers your environmental impact without impacting your comfort

Keystone

• 3-IN-1 FUNCTIONALITY - Midea's 3-in-1 technology combines air conditioning, dehumidification, and fan-only modes that work together to increase the comfort of your home
• FAST COOLING - This 8, 000 BTU model provides fast and efficient cooling and dehumidification ideal for rooms up to 350 square feet. Cools down your home, office or apartment for maximum comfort.
• INNOVATIVE FEATURES – An intuitive design remote control and a LED digital display panel will make it easy to change all the settings from across the room.
• EASY INSTALLATION - This window unit installs easily without significant modification to the existing window frame (23-36" x 15. 5"). All mounting accessories (23-36" x 14 ") are included. A screwdriver is required (but not included) for installation. For some window frames, pilot holes are recommended before installing screws. Please see included instruction manual for further detail
• WORLDWIDE - Midea is the world’s largest provider of air conditioning products. As a testament to our dedication to quality, we offer a one year parts and labor on this product

Midea

• Installation Kit Included
• Auto restart, Sleep mode, 24hr on/off timer, Follow Me, R410 A eco-friendly refrigerant
• Easily-Removable and Washable Filter Included
• BTU Cooling: 10,000

Global Industrial

• 【Wide Application】Portable ac window kit suitable for portable mobile air conditioners, dryers, exhaust dryers, and dehumidifiers. Block the return of hot air and reduce the power consumption effectively, save electricity charges, more energy saving.
• 【Ingenious Innovative】Air conditioner window Seal Simply apply the adhesive hook tape to the inside of your window frame and to the window itself. Attach the window seal to the hook tape. Then, open the zip on the window seal and place your air conditioner hose out of the window. In the end, close the zip tightly around the hose.
• 【Energy Saving In Summer】Ac window seal is made of durable nylon material for easy sashing slide. Push through the tube, the zipper closed and the heat stays outside. This practical airlock prevents the warm exhaust air from returning into the room. The windows can be closed easily when leaving. There is no need to disassemble.
• 【Keep Indoor Cool The Air 】Window seal for portable air conditioner around open window, zips around the nozzle of your air conditioner hose stopping the return flow of warm air and making your air conditioner as efficient as possible.
• 【Designed For Casement Window】Air conditioner window kit not suitable for sliding windows, suitable for windows that bottom hung windows or skylights, fits window with a maximum perimeter of 400 CM(four sides of the window).

gulrear

• Simply slide the saddle air conditioner over the window sill for a safe installation without any tools required or risks of the air conditioner falling out of the window. The maximum window sill clearance this unit will fit in is 11 inches. Fits windows 24" to 48" wide. Fits windows with a minimum of 16" height clearance.
• Exclusive design combines the benefits of a portable ac, window ac and mini-split ac into a simple format
• Keep the view outside and full use of your window even after installation without having to remove the air conditioner
• Activate the MyTemp sensor on the remote control and relax anywhere in the room while the air conditioner cools to your exact location. Save on energy costs with the 24-hour timer, energy saver mode, and sleep mode and rest easy knowing the air conditioner with automatically restart after a power interruption
• Electronic controls and LCD remote control keep all of the industry-leading features at your fingertips. Washable and reusable filter for easy maintenance and extended product life.

Soleus Air

• UNIVERSAL - Suitable for portable mobile air conditioners, dryers, exhaust dryers and dehumidifiers.Fits window with a maximum perimeter of 400cm（158〃）.Suitable for sloping/casement windows.Not Suitable for hung/slider windows.
• HIGH QUALITY MATERIALS - Made of 190T polyester and environmentally friendly waterproof PU coated fabric.With self-locking zipper, it has very good adhesion but leaves no trace after tearing off. JOYPEA window seal leaves out insects, mosquitoes, rain and creates a “closed environment” that keeps your room cool for longer.
• NO MORE HOT AIR INCOMES - The window seal for portable air-conditioners kit keeps the cool air inside your room by effectively diffusing the hot air out of the window. Preventing warm air circulating in your room, keeps your room cool for longer and save electricity charges.
• EASY TO INSTALL - You don't have to buy window kits, adapters for your hose or additional tools.Simply apply the adhesive hook tape to the inside of your window frame and to the window itself. Attach the window seal to the hook tape. Then, open the zip on the window seal and place your air conditioner hose out of the window. In the end, close the zip tightly around the hose.
• 100% SATISFACTION - We stand behind the quality of our products. If for any reason you are not satisfied with your purchase, please contact us. We will work on every inquiry to ensure your satisfaction. Enjoy a cooler environment in summer.

Joypea

• QUIET & POWERFUL - Our 8,000 BTU compact air conditioner (16.5 x 11.5 x 26 in,) will keep you cool and comfortable all summer. An adjustable fan speed cools the air to 65°F at the coolest setting. Sleep mode makes it extra quiet while you rest
• PERFECT FOR SMALL ROOMS - This floor-standing portable AC unit provides steady, fast, effective cooling for rooms up to 200 sq. ft. It’s the ideal small air conditioner for dorms, apartments, cabins, campers, offices, bedrooms, or living rooms
• SIMPLE & QUICK TO INSTALL – Just wheel this portable air conditioner into any room with a double hung or sliding window. Attach the included hose (4’ 11”) & window adapter, & plug it in to an outlet! At the end of the season, just unhook & store
• EASY TO USE & CLEAN – The simple remote control & top-mounted LED display with 24-hour timer allow you to precisely control the air temperature. To clean the filter, just slide it out twice a month, rinse it thoroughly under running water, & put it back
• 3-in-1 FUNCTIONALITY - Combines 3 energy efficient functions for all of your cooling & ventilation needs with cool, fan, & dehumidifying modes all in one machine. Bucket-less, self-evaporating operation makes your living space cool, clean and dry

BLACK+DECKER

• Window Air Conditioner with 5000 BTU Cooling Capacity
• SpaceWise Adjustable Design Optional Side Panels With the Adjustable Side Panels, the side panels will extend to best fit your window.
• Power Cord Comes with an extra long three-prong cord — makes extension cords unnecessary.
• Effortless Restart Automatically resumes operating at its previous settings when power is restored to your unit.
• Quick Cool & Quick Warm When you need to cool down quickly or warm up faster, use the quick cool/warm mode to speed up the fan.
• Effortless Temperature Control Our air conditioners maintain the preset room temperature, so you will remain comfortable at all times.
• Easy-to-Clean Washable Filter Capture dust from the air and keep your air conditioner working efficiently with our easy-to-clean washable filter.

FRIGIDAIRE