10 Best Through-The-Wall Air Conditioners 2025 in the United States

The LG 9,800 BTU Through-the-Wall Air Conditioner with Supplemental Heat is designed for rooms up to 440 square feet, such as bedrooms or offices. It offers both cooling and heating functions, making it versatile for different weather conditions. With multiple fan speeds, users can customize airflow efficiently. The unit includes convenient features like a digital control panel, remote control, and auto-restart after power failures.

Its 4-way air deflection enhances flexibility, and it comes with a filter light reminder, trim kit, and washable filter for ease of maintenance. The unit's Seasonal Energy Efficiency Ratio (SEER) of 9.8 is not particularly high, indicating that it may not be the most energy-efficient option. Additionally, it operates at a noise level of 54 dB, which might be noticeable in quieter settings.

It requires a 230-volt outlet and is relatively heavy at 70 pounds, which could make installation challenging. Despite these drawbacks, its ability to cool medium-sized rooms effectively and additional heating feature make it a practical choice for users seeking a multi-functional air conditioning solution.

The LG 14,000 BTU through-the-wall air conditioner is designed to cool medium-sized rooms up to 700 square feet, making it suitable for bedrooms, living rooms, apartments, or offices. Its cooling power is strong enough to keep spaces comfortable during warm months. The unit features three fan speeds and an auto-cool mode, letting you adjust airflow to your liking. The 4-way air deflection allows you to direct air where it’s needed most.

With an Energy Efficiency Ratio (EER) of 9.3, it offers decent energy savings, though not the highest on the market. This model operates quietly at 58 decibels, which is about the sound of a normal conversation, so it won't be too disruptive. Installation requires a specific wall sleeve and a 230/208V power supply, so it's important to ensure your wall and electrical setup can accommodate this. The air conditioner comes with a user-friendly digital control panel and remote, plus helpful features like a filter light reminder, washable filter, and an auto-restart function after power outages—these add convenience and ease of maintenance. Additionally, it includes a 24-hour timer to help manage energy use.

One downside to consider is its size (about 20 x 24 x 14 inches and 77 pounds), which may need a proper through-the-wall space and professional installation. Its 1-year warranty covers parts and labor, giving some peace of mind. This LG model is a good fit for those looking to cool medium rooms with a balance of good performance, useful features, and manageable noise, though compatibility with your wall and electrical setup should be confirmed beforehand.

The Keystone 12,000 BTU through-the-wall air conditioner is designed to cool medium-sized rooms up to 550 square feet effectively. Its cooling capacity is well suited for bedrooms, bathrooms, and nurseries, providing three cooling modes and three fan speeds, which allows you to customize comfort. The unit includes a built-in dehumidifier removing about 2.3 pints of moisture per hour, which is helpful in reducing humidity alongside cooling. At 56.5 decibels, the noise level is relatively quiet for an air conditioner of this size, making it suitable for spaces where low noise is appreciated.

Energy efficiency is decent with a Seasonal Energy Efficiency Ratio (SEER) of 10.5, and features like 'Energy Saver' and 'Sleep' mode help keep electricity costs down. It lacks a BEE star rating, which some may consider when comparing energy use. The dimensions (20.3"D x 24.2"W x 14.5"H) mean it requires a compatible wall sleeve for installation, but the included universal trim kit simplifies this process and keeps the look neat—plus, it saves window and floor space.

Additional features include a smart remote with an LCD screen that measures room temperature and adjusts settings regularly, a filter light reminder, and a programmable timer, enhancing usability. The unit runs on 230 volts and uses 1142 watts, which is typical for an AC of this size but might require electrical compatibility checks. The weight (78.1 pounds) may require professional installation. The one-year warranty on parts and labor, plus an additional four years on the sealed system, offers reasonable peace of mind. This air conditioner is a solid choice for someone looking for a reliable, moderately energy-efficient, and convenient through-the-wall cooling solution for medium rooms.