10 Best Wall AC Units 2025 in the United States

The MRCOOL 12000 BTU 5th Gen DIY mini split unit is a versatile wall-mounted air conditioner and heat pump combined, designed for spaces up to 550 square feet like homes, offices, or small commercial areas. Its cooling capacity of 12,000 BTUs (or 1 ton) is solid for medium-sized rooms. A strong point is its high Seasonal Energy Efficiency Ratio (SEER) of 23.5, meaning it uses energy efficiently, which can help reduce electricity bills. The unit runs quietly at 45 decibels, so it won’t be disruptive. Installation is made simple with a DIY-friendly design including pre-charged line sets, allowing many users to set it up without special tools or professional help, saving time and cost.

The system includes useful features like a dehumidifier, sleep mode, and remote control with Wi-Fi connectivity, compatible with smart home devices like Alexa and Google Assistant for convenient temperature control anywhere. It also provides year-round comfort thanks to its heating and cooling functions. While the unit covers a decent room size, it might be undersized for larger spaces. The sleek, white design fits well with most interiors.

Taking into account its energy efficiency, quiet operation, and ease of installation, this MRCOOL unit is an excellent choice for those wanting a reliable mini split system with smart features, especially if you’re comfortable with a DIY installation and need effective heating and cooling for medium-sized areas.

The MRCOOL 24000 BTU Ductless Inverter Mini Split is a solid choice for cooling and heating spaces up to about 1,050 square feet, making it suitable for medium-sized rooms in homes, offices, or small commercial areas. With its 24,000 BTU capacity, it provides strong cooling power, and the included heat pump means you can use it year-round for both comfort and convenience. It runs at a relatively quiet 43 decibels, which is gentle enough for most living or working environments. The unit has a 2-star BEE rating, indicating moderate energy efficiency; it might not be the most economical option in terms of power use but should be reasonable for regular use.

Installation is user-friendly since it’s part of MRCOOL’s DIY Easy Pro Series, designed for easier setup compared to traditional split systems, and maintenance is simplified with features like easy-to-clean filters and a refrigerant leakage detector, helping keep the unit running smoothly and indoor air quality fresh thanks to its Active Clean Technology. The unit measures around 33 inches wide and 21 inches high, so it’s a relatively large wall unit, requiring adequate space for installation.

While it covers cooling and heating well, individuals looking for the highest energy efficiency or the quietest operation might find better options elsewhere. This unit offers a balanced combination of power, convenience, and basic energy considerations for users needing a reliable all-in-one heating and cooling solution without complex installation.

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.