10 Best Energy Efficient Window Air Conditioners 2026 in the United States

The Midea MAW12V1QWT U-Shaped Window Air Conditioner stands out for its energy-saving capabilities, boasting over 35% savings thanks to advanced DC inverter technology and a strong 5-star energy rating. With a cooling capacity of 12,000 BTUs, it effectively cools rooms up to about 550 square feet, making it a solid choice for medium-sized spaces. One of its most notable features is the ultra-quiet operation at just 32 decibels, which is much quieter than typical window ACs, ensuring minimal noise disturbance.

The unique U-shaped design is clever, as it allows you to keep your window partially open for fresh air and a better view, while also including an anti-theft lock for safety. Smart controls are another plus, allowing remote adjustments through a phone app or voice assistants like Alexa and Google Assistant, adding convenience for modern users. Installation is straightforward with a quick-snap bracket, suitable for most single or double-hung windows between 22 and 36 inches wide. The unit includes a dust filter with a clean filter indicator to help maintain air quality.

While the unit is efficient and packed with features, it weighs nearly 59 pounds, which might be a bit heavy for some users to handle during installation. Also, the warranty is limited to two years, shorter than some competitors offer. This Midea model is well suited for those wanting an energy-efficient, quiet, and smart window AC with easy installation and a fresh-air friendly design.

The LG 12,000 BTU Smart Window Air Conditioner is a solid choice for cooling medium to large rooms up to about 550 square feet, like kitchens or living rooms. Its 12,000 BTU rating means it can handle substantial heat removal, keeping your space comfortable without working too hard. While it doesn't have an Energy Star rating, its Seasonal Energy Efficiency Ratio (SEER) of 12 is decent, offering a balance between cooling power and energy use. Noise levels are quite reasonable, running as low as 52 decibels on low settings, so it won’t be too disruptive in quiet environments.

This model shines with smart features, including LG ThinQ app control and compatibility with Alexa and Google Assistant, letting you adjust settings from your phone or with voice commands—very handy if you want to avoid getting up to change the temperature. It also includes useful functions like multiple fan speeds, a 24-hour timer, and 4-way air deflection to help distribute air evenly.

Maintenance is user-friendly thanks to the dust filter and a filter light reminder, helping you keep the unit clean and efficient. Installation is straightforward with the included kit, though the unit is fairly heavy at 81 pounds, so you might want help putting it in place. If you value smart controls and solid cooling for a mid-size room and don’t mind moderate noise and energy consumption, this LG air conditioner offers a convenient and effective solution.

The Midea 8,000 BTU U Shaped Smart Inverter Window Air Conditioner is designed for cooling medium-sized rooms up to about 350 square feet with notable energy efficiency. Thanks to its DC inverter technology, it saves around 37% more energy compared to traditional window ACs and holds an ENERGY STAR certification, which is a reliable sign of its efficiency. It operates quietly at just 32 decibels, making it one of the quieter models you’ll find, and its unique U-shaped design lets you keep the window open for fresh air and a better view—something uncommon in window units. This shape also helps block outside noise effectively.

In terms of smart features, it supports Wi-Fi control through an app and voice commands via Alexa or Google Assistant, providing convenient remote operation. The included remote makes manual control easy too. Installation is straightforward with a quick-snap bracket fitting most single-hung or double-hung windows between 22 and 36 inches wide. The unit also includes a dust filter and a dehumidifier function, enhancing air quality and comfort.

The cooling capacity of 8,000 BTUs is best suited for rooms around 350 sq ft, so it might not work well in larger spaces. Although it doesn’t specify a programmable thermostat, the app control can likely fill that role but might require some tech comfort. The filter is washable but will need regular maintenance to keep performance high. While the noise level is very low, the power consumption at 710 watts is typical for this size but might be a bit high if you use it extensively in very small rooms. If you want a quiet, energy-saving window AC with smart home integration and the ability to keep your window partly open, the Midea U Smart Inverter is a strong choice. Just keep in mind the room size limits and plan for occasional filter cleaning.