10 Best Efficient Window Air Conditioner 2025 in the United States

The Amazon Basics 5000-BTU Window Air Conditioner is designed for small rooms up to 150 square feet, making it a good fit for bedrooms, home offices, or other small spaces. With 5000 BTU cooling power, it provides enough cooling for these areas without consuming excessive energy, supported by a decent energy efficiency rating (SEER of 14). It offers flexible comfort options including 7 temperature settings, 2 fan speeds, and adjustable air direction, which helps tailor the airflow to your preference. The unit features a washable filter that is easy to clean and helps reduce dust and allergens, which is a useful bonus for maintaining air quality.

Installation is straightforward for standard windows between 23 and 36 inches wide with a basic mounting kit included, though you’ll need a screwdriver as it’s not supplied. Noise-wise, it operates quietly at around 56 dB, suitable for use in bedrooms or workspaces where low noise is appreciated. The cooling capacity limits it to smaller rooms only, so it wouldn't be ideal if you need to cool larger spaces. Also, it lacks advanced features like a remote control or smart connectivity, which some may expect in modern units.

Its size is compact, making it less intrusive once installed, and the simple mechanical controls keep operation easy for anyone. This unit is a practical and affordable choice if you need efficient cooling in a small room and prefer a basic, user-friendly window AC without extra bells and whistles.

The Midea MAW06R1CWT EasyCool is a versatile 6,000 BTU window air conditioner suitable for cooling, circulating air, and dehumidifying spaces up to 250 sq. ft., making it ideal for small rooms, apartments, or offices. With a Seasonal Energy Efficiency Ratio (SEER) of 12.1, it is fairly energy-efficient, though it does not have an Energy Star certification. The unit operates at a low noise level of 52 dB, ensuring a quiet environment, which is a significant benefit for both home and office use.

The included LED display and remote control make it user-friendly, allowing you to adjust settings easily from a distance. Installation is straightforward with all necessary mounting accessories provided, though a screwdriver is required for setup. The device also features a removable and reusable filter, aiding in the maintenance of clean air by trapping dust and pet hairs. The unit’s compact dimensions (13.1 x 15.98 x 12 inches) make it easy to fit into most standard window frames (23"-36" x 14").

Additional energy-saving features like Eco mode and an EasyTimer are welcome bonuses that can help reduce electricity bills. However, the unit's lack of Energy Star certification may be a downside for those specifically looking for the most energy-efficient options. The one-year parts and labor warranty also provides some peace of mind regarding its durability and reliability.

The Midea MAW10V1QWT is a 10,000 BTU window air conditioner designed to cool spaces up to around 450 square feet efficiently. It stands out for its ultra-quiet operation, producing just 32 decibels of noise, which is quite low compared to many traditional window units, making it a great choice for bedrooms or offices where quiet is important. Thanks to its advanced DC inverter technology, it offers more than 35% energy savings over standard models and has earned an ENERGY STAR certification, so it’s friendly on your electric bill. The unit’s U-shaped design is unique, allowing your window to remain partially open for fresh air and a better view, while also featuring an anti-theft lock for security.

Installing it is straightforward with the included bracket, fitting windows 22 to 36 inches wide and at least 13.75 inches tall. Additional handy features include a dehumidifier, dust filter, and fast cooling, controlled remotely via a smartphone app or voice assistants like Alexa and Google Assistant, adding convenience to daily use. While the unit is energy efficient, its cooling capacity is fixed at 10,000 BTU, which might not be sufficient for larger rooms. Also, the plastic build and weight of nearly 57 pounds could make installation a bit challenging for some. The unit requires 115 volts and uses R32 refrigerant, which is common but worth noting for environmental considerations.

Customer reviews are generally positive, with a rating of 4.1 out of 5, reflecting satisfaction with its performance and quietness. If you want a quiet, energy-saving window air conditioner with smart controls and a modern design that fits smaller to medium rooms, this Midea model is a solid option to consider.