7 Best Through Wall Air Conditioning Units 2026 in the United States

The LG 9,800 BTU Through-the-Wall Air Conditioner is designed to efficiently cool or heat medium-sized rooms up to 450 square feet. Its cooling capacity of 9,800 BTUs and supplemental heating option make it versatile for year-round use. The unit is equipped with two cooling, heating, and fan speeds, allowing users to easily adjust the temperature and airflow to their preference. The electronic controls and included remote enhance usability and convenience, while the auto restart feature ensures the unit resumes operation after a power outage, which is a handy addition.

Measuring 20.09 inches deep, 24 inches wide, and 14.41 inches high, it fits well in standard through-the-wall openings and includes a trim kit for a clean installation. The noise level of 56 dB is moderate, which might be noticeable but not overly disruptive for most users. Additionally, the dehumidifier function is a bonus for those living in humid climates. However, the unit has an Energy Efficiency Ratio (EER) of 9.8, which is not the highest, meaning it may not be the most energy-efficient option available. It is also not Energy Star certified, which might be a consideration for those looking to maximize energy savings.

At an annual energy consumption of 2900 watts, it is relatively efficient but could incur noticeable electricity costs over time. This air conditioner is an excellent option for those needing reliable cooling and heating in a medium-sized space, though more energy-conscious buyers might want to explore other options.

The OLMO 8,000 BTU Through-the-Wall Air Conditioner is a versatile unit that offers both cooling and heating options, making it suitable for year-round use in residential, commercial, and hotel settings. With a cooling capacity of 8,000 BTUs and a heating capacity of 4,200 BTUs, it is designed to efficiently manage the temperature in medium-sized spaces. The unit operates on 115 volts and comes pre-charged with R-32 refrigerant, which is more environmentally friendly compared to older refrigerants.

The included wall sleeve simplifies installation, and the dimensions (20.28"D x 24.21"W x 14.53"H) ensure compatibility with standard wall openings for through-the-wall units. The noise level is reasonably low at 52 dB, which is comparable to a normal conversation, making it suitable for living areas and bedrooms. However, it is not Energy Star certified, which implies it may not be the most energy-efficient option available. The unit can be controlled via a digital panel with LED display, a remote control, or a compatible wireless smartphone device, adding a layer of convenience.

Weighing 80 pounds, it may require assistance during installation. Additionally, its WiFi capability allows for remote operation, which can be a significant advantage for tech-savvy users. This unit would be particularly beneficial for those looking for a reliable and versatile climate control solution that offers modern features like remote and WiFi control.

The Keystone 12,000 BTU window-wall air conditioner is a solid choice for cooling medium-sized rooms up to 550 square feet. It offers a balanced cooling capacity that can handle larger living rooms or apartments comfortably. One of its strengths is the supplemental heating feature, which provides extra warmth when temperatures are mild, though it’s not designed to replace your main heating system. The unit's energy efficiency is decent, with a Seasonal Energy Efficiency Ratio (SEER) of 10.9, which helps keep electric bills reasonable, especially if you use the energy-saving and sleep modes.

In terms of size, its dimensions (about 19" deep, 21.5" wide, and 14.6" high) make it compatible with typical window or wall sleeves, and it includes a window installation kit to simplify setup. Noise level is moderate at 55 decibels—comparable to a quiet conversation—so it may be noticeable but not overly disruptive in daily use. Additional features like a remote with a room temperature sensor, 4-way air swing, dehumidifier, and filter reminder add convenience and comfort.

On the downside, the supplemental heating is limited to certain outdoor temperature ranges, and some users might find the noise level a bit high for bedrooms or very quiet spaces. The warranty covers parts and labor for one year, with extended coverage for the sealed system, giving some peace of mind. This unit is well-suited for those needing a reliable and multifunctional window or wall air conditioner that balances cooling, heating, and dehumidifying in medium-sized rooms without breaking the bank.