10 Best Air Conditioner Horizontal Sliding Window Unit of 2025

Tested and Reviewed: Top 10 Air Conditioner Horizontal Sliding Window Unit deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

PerfectAire

Perfect Aire 10,000 Slider Air Conditioner Window A/C-Casement, 10000 BTU, Gray

Editor's bottom line:

“This air conditioner horizontal sliding window unit is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Adjustable temperature settings that range 62°F - 86°F (17°C - 30°C); cools areas between 400-450 sq. ft.
Expandable window mounting kit accommodates horizontal sliding or crank-out casement windows with a 15½/16¼ (min./max.) window width and a 21¼/39½ (min./max.) window height
3-speeds in both cool and fan modes
Full function remote control with Follow Me portable thermostat technology for total room coverage
Front-mounted, tilt-out air filter access for easing cleaning

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Picked by 279 people today

9.5

Save 11%

Midea

Midea MAW08HV1CWT EasyCool Smart Inverter Air Conditioner Window Unit with Heat, 8,000 BTU, White

11% OffFree Shipping

Main Highlights

Multi-Season Comfort - Midea 8000 BTU window air conditioner with heat is better than standard ac units. It will beat the heat in summer with powerful cooling and dehumidification and keep you warm through the fall with supplemental heat. Best for large rooms up to 350 square feet. NOTE: heat pump function works when outside temp> 41°F.
Easy To Use This air conditioner and heat unit comes with an LED display, 5 Modes (Heat, Auto, Cool, Dry, Fan), 3 speed settings (Auto/H/M/L), 24-hr Timer, and ECO energy saver. The Swing button adjusts the louvers up/down to direct the airflow. Control your wifi enabled window ac with heat unit from anywhere with the SmartHome App, or with your voice via Alexa and Google Assistant. All functions can be set via the control panel, remote control, and app or voice assistant.
Save Energy Being Cool Save on energy costs and enjoy ultimate comfort with this energy star certified unit. This energy efficient air conditioner unit is engineered with variable-speed inverter technology that will quickly cool your bedroom or apartment space while using considerably less electricity; up to 35% energy savings compared to the Energy Conservation Standard. Washable filter is easily accessed from front panel for regular cleaning to maintain peak performance.
Ultra Low Noise Performance This ac window unit operates at a noise level as low as 45 dBA. Its such a quiet air conditioner that you will barely notice it, even when its on high. Enjoy your Zoom call, watch your favorite TV show, have a conversation. This ac unit for bedroom also creates just the right amount of white noise so you can get some rest.
Install Specs This window air conditioner is designed to fit double hung windows with opening widths of 24 to 38.5 inches. Lower sash must open sufficiently to allow a clear vertical opening of 14.5 inches. AC window unit measures 19.41"W x 22.17"D x 13.9"H. Included components: 8000 btu window air conditioner, remote control, installation kit. This ac heater combo window unit is as a close as you can get to a mini split a/c. You may like it so much you just might buy two!

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9.5

Coolblus

Coolblus 12000 BTU Portable Air Conditioners Cool Up to 550 Sq.Ft,3-in-1 AC Unit with Remote Control/LED Display/Installation Kits & Screwdriver/24Hrs Timer for Home/Office,White

Main Highlights

3-in-1 Cooling/Dehumidify/Fan Mode Enjoy the convenience of Cooling,Fan,and Dehumidify modes with this air conditioner portablewhich meets your needs all year round.And the 95 pints/day dehumidifier removes excess moisture, creating a comfortable and healthy environment. Perfect for living room, bedroom, apartment, home kitchen,basement,office and more!
Powerful Cooling & Energy EfficiencyThe Coolblus portable air conditioner delivers 12,000 BTU (ASHRAE) cooling power, making it perfect for spaces up to 550 sq. ft. Equipped with the most energy-efficient compressor and environmentally friendly R32 refrigerant, it quickly cools your room and maintains a comfortable temperature between 61°F and 88°F. Whether its a hot summer day, the Coolblus portable ac unit ensures fast and efficient temperature control, keeping your room comfortable all day.
Easy Installation & PortabilityDesigned for convenience, this portable air conditioner comes with 360° wheels and side handles for easy movement between rooms. The window sealing kit and exhaust hose make installation a breeze,fitting most vertical and horizontal windows.Set up in just 3 simple steps and enjoy cool air in minutes!
Drainage-Free & Easy MaintenanceThanks to its built-in water self-evaporation system,this portable ac requires no drainage in most conditions.The water automatically evaporates through the hose during daily use. However, in high-humidity environments 80°upthe drainage is needed every day to prevent the unit from stopping due to a full internal water tank. Simply unplug the drain plug at the back,connect the included drain hose, and restart the machine. Additionally,the washable filters are tool-free and easy to clean,ensuring long-lasting performance with minimal maintenance.
Smart Remote Control & Sleep Mode with 24H Timer Control your portable air conditioner effortlessly with the easy-to-read front LED display and touch panel, combined with a full-function remote control featuring an LED display and a 33-foot control range.And the Sleep Mode operates at a quiet <52dB, ensuring a peaceful nights rest. while the 24-hour timer helps save energy by automatically turning off the unit.while for safety and efficiency, the air conditioner will automatically shut off when the surrounding temperature reaches 40°C/104°F and will restart once the temperature drops to a safe level.

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9.2

DOMANKI

DOMANKI 10000 BTU Portable Air Conditioners Cools up to 450 Sq. Ft 3-in-1 Poratble Ac Units for Room with Dehumidifier Fan Sleep Mode 24h Timer Remote Control and Window Installation Kit Included

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Main Highlights

[Powerful Cooling]: 10,000 BTU ASHRAE, 115V/60Hz, R32 refrigerant, ETLcertified portable air conditioners offers localized, effective cooling (61°F to 88°F) in minutes and energy efficiency, suitable for rooms up to 450 sq. ft., such as bedrooms, offices, and living spaces and apartments.
[3-in-1 Function]: This portable ac unit combines cooling, fan and dehumidifying modes, with 58.6 L/day dehumidifying capacity and 220m3/h airflow, It features 2 fan speeds, 24h timer and sleep mode bring you a cost-effective cooling solution.
[Simple and Efficient]: The self-evaporating portable air conditioner has a stable cooling system and performance with an LED display, and a remote control (up to 25 ft range). You can use it from your couch or bed and easily control the mode and temp to meet your individual needs and stay cool.
[Quiet & Timed Operation]: The portable room air conditioners with a noise level of approximately 51dB in sleep mode, giving you a comfortable cool, uninterrupted night's sleep. In addition the 24hrs timer allows you to preset cooling times for added convenience.
[Easy To Use]: Measuring 13 in x 25 in x 17 in (W x H x D), the air conditioner portable features casters and a concealed handle for easy movement. It includes a removable, washable filter for optimal air quality and a complete installation kit for vertical and horizontal sliding windows (fits standard windows up to 38in)

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9.0

Save 9%

SereneLife

3-in-1 Portable Air Conditioner with Built-in Dehumidifier Function,Fan Mode, Remote Control, Complete Window Mount Exhaust Kit

9% OffFree Shipping

Main Highlights

HANDY AND PORTABLE: The SereneLife Portable Air Conditioner System features a lightweight, handy, sleek body design intended to be used in the bedroom, living room or garage at home or office. It features rolling wheels for easy portability
THREE OPERATING MODES: The compact floor AC indoor cooler conditioning unit features a simple electric plug in operation and introduces 3 modes - cooling, dehumidifier and fan. The default mode is cooling, it is automatically activated after power ON
BUILT-IN DEHUMIDIFIER: You dont only get the cooling effect of the portable AC but also helps reduce humidity levels, which makes your home less hospitable to allergens such as dust mites, mold, mildew by selecting dehumidifier mode
REMOTE CONTROL: Features a digital touch button control panel which includes the power, mode, timer, temperature and fan speed settings. Other functions such as unit selector (°C/°F), sleep key can be adjusted using the included remote control
EIGHT THOUSAND BTU Cooling Power: With 900W rated power and 8000 BTU cooling power, the cold air can cover a room of up to 215+ sq ft! Air flow is rated at 290 m3/hr, moisture removal/dehumidifier at 1.2 liters/hr w/ an operating noise level of only 55-57 dBa

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8.8

Midea

Midea 8,000 BTU U-Shaped Smart Inverter Air Conditioner – Cools up to 350 Sq. Ft., Ultra Quiet with Open Window Flexibility, Compatible with Alexa, 35% Energy Savings, Remote Control (Renewed)

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Main Highlights

ULTRA QUIET - The U-shape design of Midea U Smart Inverter AC uses your window to block noise outside. The highly-efficient inverter system warrants ultra-low noise and vibration, 9x quieter than traditional units with operation as low as 32 dBA.Cooling Watts : 710W, Rated Cooling Amps (AHAM) : 8.78.Airflow (CFM) Roomside (hi low) : 215/150. Refrigerant : R32
MORE THAN 35% ENERGY SAVINGS - With the advanced DC Inverter technology, Midea U achieves over 35% energy savings compared to other traditional units.
SMART CONTROL - Midea U Smart Inverter AC is Wi-Fi enabled and can be controlled from anywhere using the MSmartHome app on iOS or Android. You can also use voice commands throughout your house, office, or apartment using Alexa or Google Assistant devices
FLEXIBLE WINDOW OPENING - The U-shaped design allows your window to open, bringing fresh air into your home and maintaining more of your view when the unit is installed. When the window is closed, the Anti-Theft Mechanism locks the window for added safety
ROBUST INSTALLATION - Install the included quick-snap bracket, set the unit on the bracket, and secure the sidearms. Then you are all done and ready to enjoy. Available for single-hung or double-hung windows with width 22"-36", minimal height at 13.75"

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8.6

Soleus Air

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

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Main Highlights

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 28.5 inches to a max height of 48 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.

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Best Value

8.3

Save 17%

Frigidaire

Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner, 5,000 BTU with Temperature Control and Easy-to-Clean Washable Filter, in White

17% OffFree Shipping

Main Highlights

Effortless Temperature Control: Our air conditioners maintain the preset room temperature, so you will remain comfortable at all times.Controller type:Button Control.Air Flow efficiency:136 CFM.Core material : Aluminium Alloy..Plug Type : LCDI 5-15P. Refrigerant Type : R-32.
Easy-to-Clean Washable Filter: Capture dust from the air and keep your dehumidifier working efficiently with our easy-to-clean washable filter
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
Compatible with our mounting bracket (B0872XNZP3) and side panel (B0872Y4MCL). These accessories are sold separately
The air conditioner is designed to install in standard double hung windows with opening widths of 24 to 36 inches (610 mm to 914 mm

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8.1

UNAOIWN

Portable Air conditioner Window Kit, Adjustable Vertical/Horizontal Sliding Window Kit Plate for AC Unit, AC Window Vent Kit, AC Window Seal Suitable for 5.9” AC Exhaust Hose

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Main Highlights

WINDOW KIT: UNAOIWN AC window vent kit includes 4 plates, 5.9 diameter duck coupler, a filter, 4 screw accessories (THIS KIT WITHOUT AC HOSE AND A/C UNIT). It applies to air conditioning 5.9inch vent hose (whether it is a clockwise or counterclockwise air-conditioning exhaust hose). Great for most portable air conditioners in the market.
DURABLE MATERIALS: UNAOIWN window seal kit is made of high-quality PVC, which anti-extrusion, anti-aging, and can be used year after year. Simple and stable fixing method for install and disassemble easily, suit for using in home or office. Easy to store, and save space.
VERTICAL & HORIZONTAL USE: It is suitable for most vertical and horizontal sliding window. You can make any combination according to the size of the window: use a 2-board combination, a 3-board combination or a 4-board combination. It is convenient to use in any place. No tools required, our AC exhaust kit is easy to slide the sealing plate and quickly lock. Adjustable length range: 17 inches or 27inch to 65 inches.
EXCELLENT SEALING PERFORMANCE: There is a gap between the fixed plate and the adjustable plate because the adjustable plate needs to be inserted into the fixed plate. Therefore, the SEALING STRIP IS A MUST. Our air conditioner sealing plate set includes a 3.5M sealing strip; The sealing strip is attached to the connection between the sliding window and the plate, which can keep your room cool at all times, effectively isolate the hot air from entering and save power.
EXCELLENT USER GUIDE SERVICE: We are committed to solving any problems that may occur. 24 hours online customer service, so that you are 100% satisfied. Please feel free to buy any goods from us.

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8.1

Loviga

Loviga Portable Air Conditioner Window Kit, Window Vent Kit Seal Kit for Portable Air Conditioner Dryer, 10x40~64 Inch Length Adjustable 2022 Upgraded 100% Sealing Waterproof Easy to Install

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Main Highlights

Adjustable Universal SizeLOVIGA Portable AC Window Seal Kit size in (Width)10x40~64 inch(Length), length is adjustable from 40~64 inch, matching all portable air conditioners and air dryers, fit horizontal or vertical SLIDING WINDOW ONLY (single-hung and double-hung).
Better SealingReplacing the old zipper design with a drawstring to allow the sealing fabric to snugly fit around the exhaust hose from 1~6 INCH, this newly designed AC Vent Kit has an excellent sealing effect of true 0 gap, firmly lock the indoor cool air while also prevent outdoor heat flowing back, keep out rain, mosquitoes bugs etc. Special waterproof TU fabric with heat-insulating whitening process reflects the sun's rays efficiently, fast cooling, real energy-saving and money-saving.
More Reliable DesignThis Air Conditioner Window Vent Kit is specially designed to solve the problems of zipper type whose sealing is lacking, zipper bursting and easy to slip off, and complicated installation. Simplify the design and structurer while improving the reliability of the product. At the same time, we use solid materials, double-stitched thread and widen the Velcro and tape to further enhance the adhesion and sealing, truly durable and practical.
Easier Installation 1. open the sliding window about 7.9 inch and put the tape on the window frame 2. put the portable ac window seal along the tape 3. stick the exhaust pipe out of the round hole 4. tighten the cord lock closure and further fix the pipe with the included Velcro ties to complete the installation, no drilling holes, super simple.
Tips & Customer Service1. Clean off the dust at the window frame before applying the adhesive. 2. It is best to leave it for 24 hours after installation before use. LOVIGA offers Intimate 1-year warranty and 24-hour customer service.

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Our Best Overall Choice

Best Choice

9.7

PerfectAire

Perfect Aire 10,000 Slider Air Conditioner Window A/C-Casement, 10000 BTU, Gray

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Adjustable temperature settings that range 62°F - 86°F (17°C - 30°C); cools areas between 400-450 sq. ft.
Expandable window mounting kit accommodates horizontal sliding or crank-out casement windows with a 15½/16¼ (min./max.) window width and a 21¼/39½ (min./max.) window height
3-speeds in both cool and fan modes
Full function remote control with Follow Me portable thermostat technology for total room coverage
Front-mounted, tilt-out air filter access for easing cleaning

Show Price

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