10 Best Wall AC Units 2026 in the United States

The LG 9,800 BTU through-the-wall air conditioner is designed to cool rooms up to about 440 square feet, making it a good fit for bedrooms or small offices. It also offers supplemental heating, providing year-round comfort from one unit. The unit features two fan speeds for both heating and cooling, allowing you some control over airflow. Its noise level is moderate at around 54 dB, which is noticeable but generally not too disruptive in typical home settings.

The energy efficiency ratio (EER) of 9.8 is decent for a wall AC, helping to keep electricity use reasonable, though it's not the highest efficiency you might find. Installation requires a through-the-wall setup and the unit weighs 70 pounds, so professional installation might be needed, but it comes with a trim kit and remote control for easy operation. Maintenance is fairly straightforward with a washable filter and a filter light reminder to help keep the unit clean. Additional features like auto-restart after a power outage and 4-way air deflection add convenience and improved air distribution.

This unit includes a relatively short 1-year warranty and lacks a high Energy Star rating, which might be a consideration if you prioritize long-term durability and top energy savings. It represents a solid, user-friendly option for those needing a reliable heating and cooling wall unit for medium-sized rooms.

The MRCOOL 9000 BTU Easy Pro Series mini split is a solid choice if you're looking for a ductless air conditioner that also provides heating, making it useful all year round. Its 9,000 BTU cooling capacity is well-suited for spaces up to about 400 square feet, such as small rooms or offices. The unit runs at a noise level of 43 dB, which is relatively quiet but you might still notice it in very quiet environments. The energy efficiency rating is 2 stars, which means it works fairly well but won’t be the cheapest to run compared to more efficient models.

One of the big advantages is its DIY-friendly installation, designed so homeowners can set it up without professional help, which can save money and hassle. It also includes helpful features like a timer, refrigerant leak detection, and an air cleaning system with easy-to-clean filters to keep indoor air fresh.

Considering its capabilities, this MRCOOL model is a practical pick if you want a dependable, versatile unit that can handle both cooling and heating for smaller spaces and prefer easy installation, although the 2-star energy rating and moderate noise level may be factors to keep in mind.

The MRCOOL 18000 BTU ductless mini split air conditioner is a solid choice if you're looking to cool or heat a medium-sized space up to around 800 square feet. Its cooling capacity is strong enough for most home or small office rooms. The unit operates at 43 decibels, which is fairly quiet compared to many ACs, making it good for maintaining a peaceful environment. The 2-star BEE rating suggests it may not be the most energy efficient option available, so you might see moderate electricity use.

One standout feature is that it provides both heating and cooling, useful if you want year-round climate control without buying separate systems. Installation is designed for DIY, which can save on professional costs, but some users might find it slightly challenging if they’re new to mini splits. Maintenance is straightforward thanks to easy-to-clean filters and an active clean technology that helps keep the air fresh and units running well. Additional perks include a timer and refrigerant leak detection which adds safety and convenience.

As a 5th generation model aimed at DIY users, it may lack advanced smart features or the highest energy efficiency. Nevertheless, it remains a reliable, versatile unit for those who want a relatively quiet, all-season wall-mounted AC and heating solution without complex installation or high upfront costs.