10 Best Smallest Window Unit Air Conditioners 2025 in the United States

The Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner is a compact unit with a cooling capacity of 5,000 BTUs, making it suitable for small rooms. Its dimensions (15.25 inches deep, 16 inches wide, and 12 inches high) ensure it fits into most standard double-hung windows. The adjustable side panels allow for a secure fit, accommodating window widths from 24 to 36 inches. One of its notable strengths is the effortless temperature control, which helps maintain a consistent room temperature without constant adjustments.

Additionally, the washable filter captures dust, improving air quality and maintaining efficiency. The unit operates at a noise level of 52 dB, which is relatively quiet, making it suitable for bedrooms or living spaces where noise could be a concern. It also has an energy efficiency ratio (EER) of 11, which, while not the highest, is reasonable for its size and cooling capacity. A convenient feature is the extra-long power cord, eliminating the need for extension cords, and the effortless restart function that resumes operation after a power outage.

However, it is worth noting that the unit is not Energy Star certified, which means it may not be the most energy-efficient option on the market. Installation is straightforward, but the necessary mounting bracket and side panels are sold separately, potentially adding to the overall cost. This air conditioner is ideal for users who need a small, efficient cooling solution without advanced features and are looking for an affordable option.

The Midea 5,000 BTU EasyCool Small Window Air Conditioner is a good option for cooling smaller spaces up to 150 sq. ft. It offers a decent cooling capacity with 7 temperature settings and both cooling and fan-only modes, making it versatile for personal comfort. One of its strengths is the energy efficiency, with a CEER of 11.0 helping to lower energy costs.

This unit is also noted for its quiet operation, similar to the noise level of a refrigerator (57 dB), which is suitable for bedrooms or home offices where a quieter environment is preferred. The mechanical controls are straightforward and the air filter is reusable, which adds to the ease of maintenance. Installation is generally straightforward with included mounting accessories, though users might need a screwdriver and potentially drill pilot holes for some window frames.

A one-year warranty provides some peace of mind for buyers. However, the unit weighs 35.3 pounds, which might be a bit heavy for some users to manage alone during installation. Also, while it's designed for smaller rooms, it may not be as effective in larger or more heat-exposed areas. Given its reasonable price, this Midea air conditioner is a solid choice for those needing an affordable and efficient solution for small spaces.

The LG 6,000 BTU Window Air Conditioner is designed to cool spaces up to 250 square feet, making it suitable for bedrooms, dens, and living rooms. Its compact dimensions (17.31 x 14.38 x 11.13 inches) and lightweight build (39.6 pounds) make it a practical choice for small windows. One of its standout features is the low noise level, operating as quietly as 52 dB in low mode, which is ideal for maintaining a peaceful environment.

The unit offers good usability with an easy-to-use digital control panel, remote control, and 2-way air deflection. It also includes a filter light reminder and a slide-out, washable filter, simplifying maintenance tasks. However, its Seasonal Energy Efficiency Ratio (SEER) of 11.5 is decent but not exceptional, and it is not Energy Star certified, which might be a consideration for those looking for the most energy-efficient options.

The auto-restart feature is a useful addition, ensuring the unit turns back on after a power outage. While it does have multiple (3) cooling and fan speeds, it lacks some advanced features found in more premium models. Additionally, some users might find the maximum cooling power of 6,000 BTUs insufficient for larger or more heat-prone areas. This LG air conditioner offers solid performance and convenience for small to medium-sized rooms, but might not be the best fit for those seeking top-tier energy efficiency or more powerful cooling capabilities.