10 Best Efficient Window Air Conditioner 2025 in the United States

The Frigidaire 12,000 BTU window air conditioner is designed to cool spaces up to 550 square feet, making it a solid choice for medium-sized rooms like living rooms or large bedrooms. Its cooling capacity is suitable for these areas, offering customizable temperature settings and 6-way directional airflow for good coverage. The unit runs at about 57 dB, which is fairly quiet for a window AC, so it won’t be too disruptive in most home environments.

In terms of energy efficiency, the Seasonal Energy Efficiency Ratio (SEER) is 10.9, which is decent but it isn’t Energy Star rated, so there might be more efficient options if you prioritize lower energy bills. However, features like Eco Mode and Sleep Mode help save energy by adjusting cooling based on room use and nighttime needs. Installation is straightforward since it comes with a window kit, and its size is typical for this power level, though it weighs around 63.5 pounds, which might require two people to install safely.

Additional conveniences include a remote control for easy adjustments, a 24-hour timer, and a filter light reminder to keep maintenance hassle-free. Dry Mode is a nice bonus for reducing humidity, improving comfort beyond just cooling. The 1-year warranty is standard but worth noting for buyers seeking peace of mind. This model effectively balances cooling power with moderate noise and several energy-saving features, making it a reliable, user-friendly option. If highest energy efficiency is your priority, there are models with better ratings available.

The Frigidaire 6,000 BTU window air conditioner is designed for small rooms up to 250 square feet, making it a solid choice for bedrooms or small living spaces. Its cooling capacity is adequate for this size, offering customizable temperature settings and 6-way directional airflow for precise comfort. The unit runs quietly at about 51 dB, which means it won’t be disruptive during sleep or work. While it doesn’t have an Energy Star rating, it includes an Eco Mode and Sleep Mode to help reduce energy use, though its energy efficiency ratio (EER) isn’t specified and may not be the highest in its class. Installation is straightforward with a included window kit, and the size is compact enough for most standard windows.

Additional features like a remote control, Clean Filter alerts, a 24-hour timer, and Dry Mode add convenience and help maintain air quality. One downside is the lack of an explicit warranty longer than one year, which might concern some users. Also, it uses 545 watts of power, so it’s not the most energy-saving model available but balances performance and cost well. This Frigidaire air conditioner offers quiet, user-friendly cooling with useful extras for small rooms, though it may not be the best option if energy efficiency is the main priority.

The Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner offers a cooling capacity of 5,000 BTU, which is suitable for small rooms. It features effortless temperature control, ensuring consistent comfort. The unit has an Energy Efficiency Ratio (EER) of 11, which, while not the highest, is decent for energy savings in its category.

One notable advantage is its noise level of 52 dB, making it relatively quiet during operation, which is beneficial for maintaining a peaceful environment. The unit’s compact dimensions (15.25"D x 16"W x 12"H) make it easy to install in standard double-hung windows, and the adjustable side panels help achieve a snug fit.

However, it lacks Energy Star certification, which might be a consideration for energy-conscious users. Additional features like the easy-to-clean washable filter and effortless restart enhance its usability. The extra-long power cord eliminates the need for extension cords, adding convenience. Accessories like the mounting bracket and side panel are available but sold separately. This air conditioner is a practical choice for small spaces where ease of installation, moderate energy efficiency, and quiet operation are priorities.