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If you’re comparing the most energy-efficient window air conditioners, start with CEER—but don’t choose on that number alone. The ENERGY STAR listings below identify three models with published CEER and annual energy-use figures, plus a fourth with an efficient inverter design whose CEER was not available in the collected product information. Match each unit’s cooling capacity to your room and check that it fits your window. These are useful options, not a claim that they are the four highest-rated window ACs in every size.
Which window air conditioner uses the least electricity?
Among the three models with comparable ENERGY STAR Most Efficient figures below, the Midea MAW08V1WWT has the lowest listed annual energy use: 375.0 kWh/year. It also has the lowest listed cooling capacity, 8,000 Btu/h, and the lowest CEER of those three, at 16.0. Annual energy use alone does not show which unit is most efficient at delivering cooling across different capacities. For that comparison, use CEER alongside capacity and room requirements.
The figures for the first three models are from ENERGY STAR’s Most Efficient listings accessed in 2026. ENERGY STAR’s 2025 criteria require a qualifying room air conditioner to be ENERGY STAR certified and meet CEER thresholds under the U.S. Department of Energy test procedure or an approved waiver. Check the current ENERGY STAR Most Efficient room air conditioner listings for updated model data.
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How the four models compare
| Model | Cooling capacity | CEER | Listed annual energy use | Notable feature |
|---|---|---|---|---|
| Midea MAH09W1AGR | 9,500 Btu/h | 17.6 | 404.8 kWh/year | Heating mode, variable-speed compressor, and a design that straddles the windowsill |
| Kühl KCVS08B10B | 8,700 Btu/h | 17.0 | 383.8 kWh/year | Variable-speed compressor and a design that straddles the windowsill |
| Midea MAW08V1WWT | 8,000 Btu/h | 16.0 | 375.0 kWh/year | Variable-speed compressor |
| GE Profile ClearView PHNT10CC | 10,300 Btu/h | Not stated in the collected GE product material | Not stated in the collected GE product material | Inverter; smart window model; GE lists rooms up to 450 sq. ft. |
ENERGY STAR provides the capacity, CEER, and annual-use figures for the first three models. The GE Appliances page identifies the PHNT10CC, its 10,300-Btu/h capacity, and its ENERGY STAR designation, but the collected product material does not state its CEER or annual energy use. It belongs in the comparison as a design-oriented option, not as a numerical efficiency ranking.
#1 Best Overall
- 3 IN 1 COMFORT - The Midea EasyCool Window Air Conditioner unit has three modes to help your house, apartment, office, or room be as comfortable as possible. It can cool a space up to 150 sq. ft. quickly, circulate air with its 3-speed fan, or reduce humidity utilizing the dehumidifier mode.Controller type:Remote Control.
- QUIET & EASY TO USE - This window AC unit is low as 52dB(low mode). The intuitive LED display and remote control (batteries included) allow easy setting of time, temperature, and mode from across the room. The removable and reusable air filter protects your family and living space from dust and pet hairs.
- EASY INSTALLATION - Install easily in your home or apartment's existing window frame . All mounting accessories are included. A screwdriver is required (but not included) for installation. For some window frames, pilot holes are recommended before installing screws. Installation instructions are simple and setting it up is a breeze.
- WORLDWIDE LEADER - Midea is the air treatment brand with a motto to help make customers feel at home with each of their products. As a testament to our dedication to quality and our customers, we offer one-year parts and labor warranty on this product.
- ENERGY EFFICIENT - The EasyCool window air conditioner helps save you money throughout the year. There are also multiple custom settings to help you be even more energy-efficient like Eco mode and an EasyTimer feature to program a schedule that fits your needs.
What is the most energy-efficient window AC?
There is no single winner for every room. On the published CEER figures, the Midea MAH09W1AGR leads this group at 17.6, followed by the Kühl KCVS08B10B at 17.0 and the Midea MAW08V1WWT at 16.0. That ranking applies only to these three listed models; the GE Profile ClearView PHNT10CC cannot be placed in it without a comparable CEER figure.
CEER—the Combined Energy Efficiency Ratio—relates cooling output to energy use under a standardized rating framework. A higher CEER is useful when comparing compatible room air conditioners, but it does not tell you whether a unit has enough capacity for your room or will fit your window. Annual kWh estimates are also useful for understanding listed energy consumption, but comparing them across different capacities without considering cooling output can mislead.
Rank #2
- Effortless Cooling: Achieve optimal comfort with customizable temperature settings and two fan speeds; Effortless Temperature Control helps to maintain your preset temperatures for consistent comfort
- Easy Maintenance: Keep your air conditioner running efficiently with the easy-to-clean washable filter, designed to capture dust from the air for long-lasting performance
- Undisturbed Comfort: Experience a peaceful home environment with a quiet performance at 52 dBA – ideal for bedrooms or small spaces up to 150 sq. ft.
- Effortless Convenience: Benefit from the Auto Restart feature, which automatically restores the unit's previous settings once power is restored to the window air conditioner
- Hassle-Free Operation: The extra-long three-prong power cord eliminates the need for extension cords, while the adjustable side panels easily extend to best fit your window, ensuring a secure installation with optimal efficiency and airflow
Choose capacity and features for your room
Match cooling capacity to the space
The models listed range from 8,000 to 10,300 Btu/h. GE says the PHNT10CC is intended for rooms up to 450 square feet; that is the manufacturer’s guidance for this model, not a universal room-size rule. The evidence here does not establish equivalent room-size guidance for the other three models. Check the manufacturer’s recommendation for your room, taking account of its layout and conditions, rather than selecting by efficiency score alone.
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Consider features that change how you use the unit
- Variable-speed compressor: Listed for the Midea MAH09W1AGR, Kühl KCVS08B10B, and Midea MAW08V1WWT. The GE model is described as using an inverter. These details distinguish the models, but the available listings do not provide a consistent, quantified comparison of their real-world energy savings.
- Heating mode: The Midea MAH09W1AGR listing includes heating. Verify the product’s exact heating capability and suitability for your needs in its current product details.
- Window-straddling installation: The Midea MAH09W1AGR and Kühl KCVS08B10B are listed as straddling the windowsill. This design may affect the space used inside and outside; confirm the installation requirements for your particular window.
- Smart features: GE identifies the PHNT10CC as a smart window model. Confirm which controls and connectivity features are included in the exact model and current listing.
Check window fit, model number, and current certification
Before buying, measure the window opening and compare it with the exact model’s installation requirements. A unit’s cooling capacity or efficiency rating cannot tell you whether its cabinet, support hardware, and installation method work with your window. The evidence summarized here does not provide opening dimensions, noise measurements, current pricing, or warranty terms for all four models, so consult the current product page and installation manual rather than assuming those details.
Rank #3
- PERFECT FOR SMALLER ROOMS - Midea's Affordable Window AC unit is perfect to help your room be as comfortable as possible. It can cool 150 sq. ft. with 7 temperature settings, 2 cooling/2 fan-only speeds, and 2-way air direction to give you the perfect amount of cooling every time.
- ENERGY EFFICIENT- Midea's 5,000 BTU window air conditioner has a Combined Energy Efficiency Rate (CEER) of 11.0 which helps reduce the energy costs to save you money throughout the year.
- QUIET & EASY TO USE - This window AC unit is quieter than a household refrigerator. It also features easy-to-use mechanical controls to quickly set the time, temperature, and mode and has a removable & reusable air filter.
- EASY INSTALLATION - Easily install in your home or apartment's existing window frame. Suitable for windows 23''-36'' wide and minimum 13'' high. All mounting accessories 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.
- WARRANTY: 1 Year Parts & Labor Warranty comes with each Midea product to ensure the quality of our brand to our customers. Our team is happy to help if any questions or issues arise and make sure to register your product on our website for even faster support in the future.
- Confirm the model identifier. Match the complete model number on the product listing to the model in the ENERGY STAR record. Similar names or capacities do not establish that two model numbers are the same product.
- Verify certification and rating. Check the current ENERGY STAR listing for the exact model and its latest CEER and annual-use information, where provided.
- Measure the window. Follow the model’s installation manual for required opening dimensions, sill conditions, support, and clearance.
- Check local rebates. ENERGY STAR provides a zip-code rebate finder. Rebate amounts and eligibility depend on location and can change; verify the terms for the exact product before counting on a rebate.
Keep similar Midea model numbers separate
An ENERGY STAR certified record for Midea model 1014242943, dated January 20, 2026, states that it uses 47 percent less energy than the U.S. federal standard. That record is for a separate 8,000-Btu model; it is not identified as the MAW08V1WWT. Do not transfer that comparison to the MAW08V1WWT based on capacity or brand alone. View the ENERGY STAR certified room air conditioner records and verify the exact model number.
Quick Recap
Best Value
- Beat the Heat – This Energy Star 7,800 BTU window air conditioner delivers powerful cooling performance with 4 Modes (Auto, Cool, Dry, Fan), 3 speed settings (Auto/H/M/L) making ideal for larger rooms up to 340 square feet.
- Easy To Use – This air conditioner unit comes with an LED display, 24-hr Timer, and ECO energy saver. The Swing button adjusts the louvers up/down to direct the airflow. Control it from anywhere with the SmartHome App and Voice Assistant Devices. It’s also Smartphone compatible.
- Save Energy Being Cool – Save on energy costs and enjoy ultimate comfort with this energy star certified unit. With a combined energy efficient ratio of 15.1, this ac unit is engineered with variable-speed inverter technology that will quickly cool your bedroom or apartment space while using considerably less electricity; up to 37% energy savings compared to the Energy Conservation Standard.
- Ultra Low Noise Performance – This ac window unit operates at a noise level as low as 39 dBA. It’s such a quiet air conditioner that you will barely notice it, even when it’s 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.
- Easy to Install – Install the included quick-snap bracket, set the air conditioner 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 23"-36", minimal height at 19.6". NOTE: NOT for casement windows. Missing a part? Call the service number in the User Manual.
Rank #4
- 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. Wireless control 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. It’s such a quiet air conditioner that you will barely notice it, even when it’s 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!
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
