10 Best Thru Wall Ac Units 2026 in the United States

The Keystone 18,800 BTU Window-Wall Air Conditioner is a versatile unit that combines cooling, supplemental heating, dehumidification, and fan circulation, making it suitable for large rooms up to 1,000 square feet. With a cooling capacity of 18,800 BTUs and a supplemental heating capacity of 16,000 BTUs, it can provide comfort year-round. The unit includes a smart remote with an LCD screen that helps maintain the desired room temperature by sending signals to the air conditioner every three minutes. It offers energy-saving modes like 'Energy Saver' and 'Sleep' to help reduce electricity bills, although its SEER rating of 10.7 is relatively average, and it is not Energy Star certified.

The noise level is 55 dB, which is moderate and may not be the quietest option available but should be manageable for most users. Installation is straightforward with the included window installation kit, and the space-saving design helps free up floor space. Additional features include a filter light reminder and a 4-way swing for better air distribution. However, it weighs 117.3 pounds, making it quite heavy and potentially challenging to install without assistance.

While it performs well in cooling and supplemental heating, it’s important to note that the heating function is not meant to replace a primary heat source, especially in extremely cold conditions. The product comes with a 1-year parts and labor warranty and an additional 4-year warranty for the sealed system, providing some peace of mind regarding durability.

The LG 11,800 BTU through-the-wall air conditioner is well suited for cooling medium-sized rooms up to around 530 square feet, making it a good fit for bedrooms, living rooms, or apartments. Its cooling power is strong enough to keep these spaces comfortable on warm days. The unit uses an energy-efficient R-32 refrigerant with an Energy Efficiency Ratio (EER) of 10.6, which helps reduce electricity costs compared to less efficient models, although it doesn’t have the Energy Star certification to guarantee top-level efficiency.

Noise level is at 66 decibels, which is a bit louder than some quieter models, so it might be noticeable in very quiet settings like bedrooms at night. Installation requires a through-the-wall sleeve, and the unit won’t work in standard window frames. It comes with a universal design to fit most wall sleeves and includes helpful accessories like a trim kit, filter, insulation foam, and a remote control, making the setup somewhat easier. The unit offers three cooling and fan speeds plus multiple modes, including Energy Saver and Dry modes, which help manage humidity and save power by cycling the compressor off when the set temperature is reached.

The product weighs 76 pounds, so installation might require professional help. The 1-year limited warranty provides some peace of mind but is fairly standard. This LG air conditioner is a solid choice if you need reliable cooling through a wall installation for medium spaces and want some energy savings, but it may be a bit noisy and installation could be challenging without assistance.

The Whirlpool 14,000 BTU through-the-wall air conditioner is designed for cooling medium to large rooms up to about 700 square feet, making it suitable for apartments and living rooms. Its cooling capacity is strong, and it includes a supplemental heating option, although this heat feature is only meant for mild temperature support, not for very cold weather. The unit offers flexible cooling with 8-way louvers, 3 fan speeds, and 4 modes, so you can adjust airflow and temperature to your comfort.

It also includes helpful functions like Eco and Sleep modes for energy savings, plus a 24-hour timer to program cooling times and reduce electricity use. Energy efficiency is moderate with a SEER rating of 9.5, which means it balances performance and cost but is not among the most energy-saving models. Noise level is around 57 decibels, which could be noticeable in very quiet rooms but is typical for through-wall units with this power.

Installation requires a 230V/20A outlet and fitting into a wall sleeve sized between 24.5 to 27 inches wide, so proper preparation is needed. Maintenance is easy because the air filter is washable and simple to access. Additional features like a dehumidifier and remote control add convenience. This Whirlpool unit provides solid cooling and some heating support with user-friendly features, while it may be somewhat noisy and less efficient compared to newer inverter models.