8 Best Through Wall Air Conditioning Units 2025 in the United States

The Keystone 14,000 BTU Wall Mounted Air Conditioner is a solid choice for cooling and supplemental heating in large rooms up to 700 sq. ft. Its impressive 14,000 BTU cooling capacity ensures efficient temperature control, while the 10,600 BTU supplemental heating capacity offers versatility for year-round use, though it should not be relied on as the primary heat source. One of its strengths is the smart remote control, which adjusts cooling based on the room temperature, adding convenience to its operation. Additionally, its energy-saving modes like 'Energy Saver' and 'Sleep' can help reduce electricity bills.

However, its Seasonal Energy Efficiency Ratio (SEER) of 9.3 is on the lower end, indicating it may not be as energy-efficient as some other models. Moreover, this unit is not Energy Star rated, which could be a consideration for those prioritizing high energy efficiency. In terms of noise level, it operates at 61.5 dB, which is relatively quiet for its capacity but may still be noticeable in quieter settings.

The installation is straightforward with the included trim kit, and it requires a 230V/20-amp outlet, which may necessitate additional electrical work if not already available. The unit’s dimensions (20.3 x 24.2 x 14.5 inches) are typical for through-wall air conditioners, ensuring compatibility with most wall sleeves. Additional features like the dehumidifier and filter light reminder enhance its functionality. The Keystone 14,000 BTU wall AC is well-suited for large living areas, offering powerful cooling and heating with practical bonuses, though its energy efficiency might be a drawback for some users.

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 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.