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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Start with three checks: choose cooling capacity for the room, make sure the unit fits your window, and compare efficiency ratings among models of similar size and construction. Then weigh comfort features and estimated operating costs. A high-efficiency rating cannot compensate for a poorly sized or incompatible unit, and no label can predict your personal electricity bill.
1. Match cooling capacity to the room
Measure the area you want to cool, then use ENERGY STAR’s room air conditioner buying guidance and its sizing chart to identify an appropriate capacity. Room area is a starting point: check the chart’s guidance for room conditions rather than selecting a unit by square footage alone.
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More capacity is not automatically better. ENERGY STAR warns that an oversized air conditioner can cost more, waste energy, and cool a room before it has removed enough humidity, leaving the space clammy. Make fit and sizing your first filters before comparing efficiency or features.
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Use CEER for similarly sized, similarly constructed units
The Combined Energy Efficiency Ratio (CEER) expresses cooling output in Btu per watt-hour under the U.S. Department of Energy test procedure. A higher CEER indicates greater efficiency under that procedure, but compare ratings within a similar capacity and construction class: thresholds differ across room-AC designs.
#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.
For units without reverse cycle and with louvered sides, ENERGY STAR Version 5.0 (2023) sets these CEER criteria by cooling capacity:
| Capacity | ENERGY STAR CEER criterion |
|---|---|
| Below 6,000 Btu/h | 13.1 |
| 6,000–7,999 Btu/h | 13.7 |
| 8,000–13,999 Btu/h | 14.7 |
| 14,000–19,999 Btu/h | 14.4 |
| 20,000–27,999 Btu/h | 12.7 |
| 28,000 Btu/h or more | 12.2 |
These thresholds apply only to the stated unit class. ENERGY STAR has different criteria for other designs, including units without louvered sides, reverse-cycle models, and casement units; check the applicable category in its room air conditioner criteria. ENERGY STAR says certified room air conditioners are at least 19–36% more energy efficient than minimum federal government standards. That is a category-level program comparison, not a promise that a particular household’s bill will fall by that percentage.
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
Read the EnergyGuide label as a comparison, not a bill forecast
The yellow EnergyGuide label provides estimated energy use and cost using stated assumptions. Use it to compare models with similar capacity and under the same label assumptions; your actual cost depends on factors such as your electricity rate and how many hours you operate the unit. The Federal Trade Commission explains the label and its estimates in its Energy Labeling Rule guidance.
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As an illustration of how assumptions shape a cost estimate, the U.S. Department of Energy’s 2024 FEMP example used a 12,000 Btu/h unit operating 750 hours per year and an assumed federal-facility electricity price of 11.1 cents/kWh as of July 2024. Its ENERGY STAR model had CEER 14.7, used 612 kWh annually, and had an estimated annual energy cost of $67 and nine-year lifetime energy cost of $480. Those are results for that example’s assumptions, not a typical household forecast. See the DOE FEMP room air conditioner guidance for context.
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.
3. Check the window and mounting design
Before buying, measure the window opening and compare it with the exact model’s installation requirements. Confirm that its mounting style works with your window and that the installation instructions can be followed in your home. A unit that does not fit securely is not a sensible efficiency choice.
Some U-shaped or saddle-style designs bracket the sill, may preserve window operation, and position the compressor farther outside. Those are design possibilities, not guarantees for every model or window. Verify the individual unit’s dimensions, mounting instructions, and any restrictions on opening the window after installation. ENERGY STAR’s buying guidance also notes that proper fit and installation matter to efficient operation.
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!
4. Weigh comfort and convenience features
Variable-speed compressors
ENERGY STAR recommends considering variable-speed compressors: variable output can support quieter cooling and energy savings. Treat that as a feature to evaluate, not a substitute for correct sizing. Check the model’s capacity, CEER, and listed energy use alongside compressor type.
Smart controls and reminders
Remote control, scheduling, energy feedback, and filter reminders can make a unit easier to manage. Decide whether you will use those functions and whether they justify any price premium. A reminder can help you keep up with filter care, but the feature alone does not establish how efficient a model is.
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.
Heating mode and refrigerant
If you want a unit that can provide heat as well as cooling, confirm that the model has a heating mode and compare the details for that mode separately. ENERGY STAR identifies R-32, R-454B, and R-290 as lower-global-warming-potential (GWP) refrigerant choices for room air conditioners. Check the specific model listing to see which refrigerant it uses; do not infer it from the brand or product family.
For a sense of the range rather than a product recommendation, an ENERGY STAR Most Efficient listing accessed in 2026 showed the Midea MAH09W1AGR at 9,500 Btu/h, CEER 17.6, and 404.8 kWh/year. The listing also described a variable-speed compressor, heating mode, a straddling-window-sill design, and R-32 refrigerant. Listings can change, and this example is not an endorsement or confirmation of current retail availability. See ENERGY STAR Most Efficient room air conditioners.
5. Make the final comparison
Once you have found models that fit the room and window, compare them in this order:
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- Capacity: Does the unit match the room area and relevant conditions in the sizing guidance?
- CEER: Which comparable models perform better within the same capacity and construction class?
- EnergyGuide: Which has lower estimated energy use or cost under the same label assumptions?
- Installation: Do the dimensions and mounting style work for your specific window?
- Features: Would variable speed, quieter operation, smart controls, heating mode, or a stated refrigerant choice matter to you?
- Ownership cost: Consider purchase price, your expected hours of use, local electricity rates, and any utility rebate for which you may qualify. Verify rebate eligibility and terms for your location.
Efficiency standards and product criteria provide context, not a forecast for a particular purchase. DOE said its 2023 finalized standards were projected to save about $1.5 billion annually on electricity bills and reduce CO₂ emissions by 106 million metric tons over 30 years; it also said the typical new room air conditioner uses 39% less energy than its 1990 counterpart. These are DOE’s projections and historical comparison, not savings estimates for an individual model or home. Read the DOE announcement on room air conditioner standards.
Quick Recap
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.
