10 Best Energy Efficient Air Conditioner of September 2025

• QUIET & POWERFUL - Our 10,000 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 150 - 250 sq. ft. It’s the ideal small air conditioner for dorms, apartments, cabins, campers, offices, bedrooms, or living rooms.
• SIMPLE & QUICK TO INSTALL – Just roll this portable air conditioner with wheels into any room with a double hung or sliding window. Attach the included hose (4’ 11”) & window adapter, & plug it in to an outlet! When not in use, 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

• 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

• FAST COOLING: 5, 000 BTU window-mounted mini-compact air conditioner is perfect for cooling a room up to 150 square feet. Quickly cools down your home, office, or apartment for maximum comfort
• EFFORTLESS OPERATION: 7 temperature settings, 2 cooling/2 fan only speeds and 2-way air direction give you the perfect amount of cooling every time
• EASY INSTALLATION: Install easily with minimal modification to the existing window frame. Suitable for windows 23''-36'' wide and minimum 13'' high. All mounting accessories are included
• ENERGY-EFFICIENT: Combined Energy Efficiency Rate (CEER): 11. 0. Helps reduce the energy costs
• WASHABLE FILTER: The reusable and washable mesh filter reduces bacteria, room odors and other airborne particles for a healthier, more comfortable environment

Midea

• ❄️【Multiple Function Modes and Two Fan Speeds: 】This portable air conditioner offers cooling, dehumidifying, fanning and sleeping modes to meet various needs of users. Under the fan mode, there are 2 fan speeds accessible, and you can set the high or low speed as you wish. 【This product is not for sale in california】
• ❄️【Optional Temperature Setting Range and Units:】Like most air conditioners, the temperature settings of this portable air conditioner range from 60℉ to 86℉. The temperature display data can be switched between Celsius and Fahrenheit, the default is Celsius, but you can choose the unit that you are familiar with.
• ❄️【Intelligent 24hr Timer and Wide Coverage Area:】There is a 24-hour programmable timer, allowing the air conditioner unit to shut down automatically once reaching the usage time. The compact 8000 BTU/H air conditioner unit delivers fast, effective cooling for spaces up to 230 Sq.Ft in home, office, cabin or camper.
• ❄️【Temperature Sensor and Water Full Indication:】Featuring a temperature sensor to sense the temperature changes, the air conditioner will stop working and keep the current temperature to save energy. This air conditioner is designed with a water-full control and warning, keeping your floor or carpet from getting wet.
• ❄️【Four Easy Moving Casters and Remote Control:】At the bottom of the air conditioner, there are four all-direction casters, allowing it to roll freely from room to room. It's worth mentioning that the air conditioner features a modern design that everyone loves, the remote control, that allowing you to set it up conveniently.

COSTWAY

• More than 35% Energy Savings: With the advanced DC Inverter technology, Midea U achieves over 35% energy savings compared to other traditional units, and it's the first window AC to obtain the ENERGY STAR Most Efficient 2020 Certification. You may also get exclusive benefits from your local energy distributor
• Extreme Quiet: 9 times quieter than some traditional units. The U-shape blocks the noise from the cooling system using your window. This design allows for extremely quiet operation as low as 42 dBA - almost as quiet as a library – so you can get a restful night’s sleep or binge your favorite shows undisturbed
• Flexible window open: Midea U-shaped design allows your window to open, bringing fresh air into your home anytime allowing you to maintain more of your view
• Smart Control: The Midea U is Wi-Fi- enabled, it can be controlled from anywhere through the cloud using the MideaAir app on iOS or Android. You can also use voice commands with Alexa or Google Assistant if you prefer
• Robust Installation: Support bracket is included for a more robust installation that supports the unit with the window open or closed.Available for single-hung or double hung window with size: 22 - 36 inches, minimal height at 13.75 inches.

Midea

• Your purchase includes One Frigidaire FFRE103WAE Window Air Conditioner of 12,000 BTU
• Air conditioner dimensions: 19” W x 14” H x 21” D | Cabinet – 14” H x 21” D (with front) | Weight – 70 lbs. | Window – 15” H x 23”-36” W | EER – 12 | Noise level – Low: 57, Med: 58, High: 59 | Pints per hour – 3
• Features three different fan speeds for more cooling flexibility
• The built-in timer allows you to preset the unit to turn on and off in half-hour increments
• Certifications & Approvals – ENERGY STAR Certified | Safety Certification: UL/CUL | ETL Listed – No | ADA Compliant - All Brands – No | NSF Certified – No

FRIGIDAIRE

• 6, 000 BTU air conditioner for window-mounted installation uses standard 115V electrical outlet (Easy window mounting kit included)
• Quickly cools a room up to 250 sq. ft. with dehumidification up to 1. 6 pints per hour
• Digital controls, 3 cool speeds, 3 fan speeds, and 2-way air direction.
• Easy installation. fits windows 21 7/8 in - 36 in wide, minimum height 13 3/8 in
• High Energy Efficiency Ratio (EER): 11. Energy Saver mode available. Easy to clean air filter included.

Haier

• Powerful 5,000 BTU rating for quiet, fast, and effective cooling for rooms up to 150 sq. ft.
• Easy to install and use, sets up in minutes with the included window mounting bracket, while the front-mounted controls are intuitive and easy to operate
• Washable and reusable filter reduces bacteria, room odors, and other airborne particles for a healthier more comfortable environment
• Auto Restart lets the unit turn back on if power is lost and maintain the same settings you had previously set.
• Mechanical rotary controls with 2 cooling speeds and 2 fan speeds (high/low)

TCL

• Install it at the window to maintain a steady temperature in your bedroom or office
• Control the temperature prolifically with 1465.36 W cooling power
• With the 150 Sq. ft. cooling coverage, keep your kitchen or living room comfortably cool
• Have more control over air flow with 2 fan speeds
• Mechanical rotary controls with 2 cool speeds and 2 fan speeds to achieve climate control when you need it most with
• Wattage: 450 watts

FRIGIDAIRE

• Programmable 24-Hour On/Off Timer
• Effortless Temperature Control
• ENERGY STAR Certified
• Multi-Speed Fan Features three different fan speeds, for more cooling flexibility.

FRIGIDAIRE