10 Best Efficient Window Air Conditioner 2025 in the United States

The LG 23,000 BTU window air conditioner is a strong contender for cooling medium to large rooms up to about 1,440 square feet, making it suitable for spacious living areas or offices. Its high cooling capacity means it can quickly and effectively lower temperatures in bigger spaces. One useful feature is its supplemental heat option, so it can provide warmth during colder months, which adds versatility beyond just cooling. It includes two fan speeds for better airflow control and has electronic controls with a remote, making it easy to adjust settings from anywhere in the room.

Installation-wise, the slide in-out chassis should simplify placing and removing the unit in a window. However, it operates at 64 decibels, which is on the louder side compared to some quieter models, so it might be noticeable in very quiet environments. The energy efficiency ratio (EER) is 9.8, which is moderate—not the most efficient but acceptable for the size and power it delivers. While the product includes a dehumidifier function and auto-restart after power outages, the warranty is only one year, which is fairly typical but worth considering for long-term durability.

This LG model is well suited for those who need a powerful, year-round solution for larger spaces and are willing to accept a bit of noise and moderate energy consumption.

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 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.