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

The Keystone 14,000 BTU through-the-wall air conditioner is designed for larger rooms up to 700 square feet, offering strong cooling power that keeps your living space comfortable during hot weather. It also features a supplemental heating function, effective in mild cold conditions but not intended to replace your main heating system. Measuring about 20 by 24 by 14.5 inches, its size fits standard wall sleeves, helping you save floor and window space.

The unit operates on 230 volts and requires a dedicated electrical outlet, so professional installation may be necessary. With a noise level around 61.5 decibels, it is noticeable yet typical for this type of AC. Its energy efficiency ratio (SEER of 9.3) is decent and can help manage power costs, though it isn’t the most efficient model in its class. Additional features include a remote control with a room temperature sensor, a dehumidifier function, and energy-saving modes for added convenience and comfort. Buyers also receive a mesh filter and a trim kit to facilitate easier setup.

Some users note that the noise level can be somewhat loud and that the supplemental heat is limited to moderate outdoor temperatures. Priced moderately and backed by a warranty covering parts and the sealed system, this unit represents a reliable, space-saving wall air conditioner suitable for year-round use without providing ultra-quiet operation or top-tier energy savings.

The BLACK+DECKER 18,000 BTU air conditioner is designed to cool spaces up to 1,000 square feet, making it a solid choice for larger rooms or small apartments. Its cooling power is strong enough for whole floors or living areas that need reliable temperature control. The unit offers four cooling levels including an auto mode, plus a fan-only setting, allowing easy adjustment of comfort levels. It includes a remote control featuring useful options like sleep mode, an energy saver, and a 24-hour timer, which can help reduce electricity use.

This air conditioner has a Seasonal Energy Efficiency Ratio (SEER) of 11.8, indicating moderate energy efficiency that balances performance with reasonable power consumption. Noise-wise, it produces about 54.5 decibels, which is noticeable but typical for air conditioners of this size—you might hear it in quiet rooms but it is not overly loud. Installation is flexible with options for window or through-the-wall mounting; the unit comes with a wall sleeve and mounting parts, though professional installation is recommended for through-the-wall setups due to wiring requirements. Its dimensions (around 25 by 24 by 18 inches) fit standard double-hung windows and typical wall openings, but measuring your space beforehand is advised to ensure compatibility.

The unit includes a one-year warranty for labor and parts, except for the compressor which has a five-year warranty, offering standard coverage. Customer reviews are generally positive, with a solid 4.2-star rating, reflecting good performance for many users. This BLACK+DECKER air conditioner presents a dependable option for strong cooling in larger spaces and offers convenient features like remote control and multiple modes, while delivering moderate noise levels and standard energy efficiency.

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.