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

The Amazon Basics Window Air Conditioner with 6000 BTU is a solid choice for cooling and dehumidifying rooms up to 250 square feet. For those seeking an energy-efficient solution, this unit stands out with a CEER of 12.1, which ensures cost-effective operation.

It comes equipped with convenient controls, including a remote, a 24-hour programmable timer, auto restart, and sleep mode, allowing you to customize your cooling experience easily. The built-in filter is both removable and washable, making maintenance easy and keeping the air clean.

Installation is designed to be straightforward, with adjustable side panels to fit standard windows, adding to its versatility. However, at 41.89 pounds, it may be a bit heavy for some users to install alone. The 6000 BTU cooling power is adequate for small to medium rooms, but those with larger spaces may need a unit with higher BTU.

The Frigidaire 12,000 BTU window air conditioner is a solid choice for cooling rooms up to about 550 square feet. Its cooling capacity suits medium to large rooms, making it practical for many home environments. With a SEER rating of 10.9, it provides decent energy efficiency, although it does not have an Energy Star certification, which means it may not be the most energy-saving option available. The noise level is moderately quiet at 57 dB, quiet enough not to be disruptive during use and suitable for bedrooms or living areas.

The unit features three fan speeds and 6-way directional airflow, allowing for customizable cooling comfort. Convenience is notable with the included remote control for easy adjustments and a 24-hour programmable timer to manage cooling schedules and help save energy. Eco Mode and Sleep Mode further aid in reducing power consumption while maintaining comfort. Maintenance is user-friendly, with washable dust filters and a filter-clean alert to keep the unit running efficiently.

One consideration is the weight—over 60 pounds—which could make installation or moving the unit somewhat challenging. Additionally, since it lacks Energy Star certification, those seeking the highest efficiency might want to explore other models. For users needing reliable, customizable cooling with straightforward controls and reasonable energy features, this Frigidaire model offers a good balance of performance and ease of use.

The Midea 12,000 BTU Smart Inverter Window Air Conditioner is a solid choice for anyone needing to cool or heat a medium to large room up to 550 square feet. Its inverter technology and Energy Star rating mean it uses electricity efficiently, potentially saving you up to 35% on energy costs compared to less efficient models. With a Seasonal Energy Efficiency Ratio (SEER) of 13.3, it performs well in cooling without running up your electric bill. This unit is also versatile since it offers heating and dehumidifying modes, making it useful beyond just summer.

One of the standout features is its quiet operation, running as low as 45 dB, which is ideal if you want a peaceful room for work or sleep. It includes multiple fan speeds, a 24-hour programmable timer, and can be controlled via a remote, an app, or even voice commands with Amazon Alexa or Google Assistant, adding convenience. The washable front filter is easy to access, helping maintain good air quality and unit efficiency.

Keep in mind that the heating function won’t work if outdoor temperatures drop below 41°F, so it’s not designed for very cold climates. Also, the noise level is noted as 58 dB in specs but described as 45 dB in marketing—expect quiet operation, but actual noise may vary depending on settings. Installation requires a double-hung window with specific dimensions, so make sure your window fits. This AC unit suits those who want a combination of cooling, heating, and energy efficiency with smart features, but it may be less ideal for strong heating needs in freezing conditions or incompatible window sizes.