10 Best Thru Wall Ac Units 2026 in the United States

The COSTWAY 12000BTU Mini Split Air Conditioner & Heater is a versatile unit designed for both cooling and heating spaces up to 750 square feet. With a high Seasonal Energy Efficiency Ratio (SEER) of 20.0, it promises excellent energy efficiency, which can lead to lower utility bills. The unit operates relatively quietly at 51 dB, which is generally considered acceptable for residential use, ensuring it won't disrupt your peace and quiet significantly.

The included remote control and multiple modes (auto, cool, dry, heat, and fan) provide flexibility and convenience for year-round comfort. The self-cleaning feature at high temperatures and auto-defrost function contribute to maintaining air quality and system longevity. However, installation must be done by a licensed HVAC installer, which could add to the initial cost and complexity. Additionally, the product uses R32 refrigerant, which is more environmentally friendly but might require specific inquiries about its availability for future maintenance.

With a robust warranty covering parts for 5 years and the compressor for 8 years, this unit offers long-term reliability. Potential buyers should consider the installation requirements and ensure compatibility with their existing setup. This unit is ideal for those looking for an energy-efficient, multi-functional air conditioning solution for medium-sized rooms.

The Whirlpool 12,000 BTU Through the Wall Air Conditioner is designed to cool rooms up to about 550 square feet, making it suitable for medium-sized spaces like living rooms, bedrooms, or kitchens. Its cooling power is solid for this size, and it offers flexible airflow with 8-way directional louvers and three fan speeds, so you can adjust the cooling to your comfort. It also includes handy features like a dehumidifier to reduce moisture, a remote control, a digital display, and a 24-hour timer for scheduling.

This model runs on a standard 115V outlet and fits into most wall sleeves between 24.5 and 27 inches wide, simplifying installation if your space matches these sizes. Noise-wise, it operates at around 56 decibels, which is noticeable but typical for through-wall units, so it might be a bit loud for very quiet rooms or light sleepers. On the efficiency front, it has an Energy Efficiency Ratio (EER) of about 11.3 (BTU divided by wattage), which is average—not the most energy-saving option on the market but reasonable for its power. The washable filter and filter light reminder help keep maintenance straightforward. However, it doesn’t have an inverter compressor, which means it may run at full power constantly rather than adjusting to save energy. The unit weighs nearly 70 pounds, so installation might require professional help.

Customer reviews are mixed, averaging 3.7 out of 5 stars, with some users appreciating its cooling ability and features, while others mention noise and installation challenges. If you want a reliable, no-frills thru-wall AC with basic energy efficiency and user-friendly controls for a medium space, this Whirlpool unit is a good choice. For those prioritizing quiet operation or top-tier energy savings, exploring other options may be beneficial.

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.