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10 Best Wall Mounted Ductless AC Units 2025 in the United States

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Our Top Picks

#1

Winner

Pioneer Diamante Series Ductless Mini-Split Air Conditioner Inverter Heat Pump Full Set with 16 Ft. Kit

Rating
10.0
Chosen by1,233
Noise Level
Installation and Maintenance
Additional Features

Most important from
370 reviews

Noise Level
The unit operates quietly and efficiently, maintaining comfortable temperatures even in extreme weather conditions.
Installation and Maintenance
Installation is straightforward, with a well-written manual making the process smooth and easy to follow.
Additional Features
Despite some initial confusion with the remote control icons, the unit performs reliably and keeps the room at a consistent temperature.

The PIONEER Diamante Series Ductless Mini-Split Air Conditioner offers a robust solution for both cooling and heating with its 12000 BTU/hour capacity. Its high energy efficiency is highlighted by a 19 SEER, making it an attractive option for those looking to save on energy costs. Additionally, the noise level is relatively low at 40 dB, which means it operates quietly, a significant plus for indoor comfort.

The included installation kit, which features a 16 ft. line set and other accessories, simplifies the installation process, although some users might still prefer professional installation for optimal performance. This unit is capable of servicing areas up to 450 square feet, making it suitable for small to medium-sized rooms or light commercial spaces. The remote control feature adds convenience, allowing users to adjust settings without having to interact directly with the unit.

However, its voltage requirement of 230V means it may not be compatible with all residential wiring setups without modification. Another consideration is the unit's weight of 81 pounds, which might necessitate additional support during mounting. Those seeking an efficient and relatively quiet ductless AC unit with ease of use and installation features will find the PIONEER Diamante Series a compelling choice.

Rating
10.0
Chosen by1,233
Noise Level
Installation and Maintenance
Additional Features

Most important from
370 reviews

Noise Level
The unit operates quietly and efficiently, maintaining comfortable temperatures even in extreme weather conditions.
Installation and Maintenance
Installation is straightforward, with a well-written manual making the process smooth and easy to follow.
Additional Features
Despite some initial confusion with the remote control icons, the unit performs reliably and keeps the room at a consistent temperature.
#2

COSTWAY 9000BTU Mini Split Air Conditioner& Heater, 17 SEER2 208-230V Wall-Mounted Ductless AC Unit Cools Rooms up to 450 Sq. Ft, Energy Efficient Inverter AC with Heat Pump (Blast Series)

Rating
10.0
BTU (British Thermal Units)
Noise Level
Installation and Maintenance

Most important from
1181 reviews

BTU (British Thermal Units)
Delivers fast and effective heating and cooling, making spaces comfortable quickly whether in a garage or living room.
Noise Level
Operates quietly enough to not disturb sleeping toddlers, even in open living spaces.
Installation and Maintenance
Installation requires professional help but is straightforward with clear instructions and manageable unit size.
Additional Features
Smart features like Alexa compatibility and a remote control add convenience to everyday use.

The COSTWAY 9000BTU Mini Split Air Conditioner & Heater is a solid choice for cooling and heating rooms up to about 450 square feet. With a cooling capacity of 9000 BTU and a SEER rating of 17, it is energy efficient compared to many basic models, helping keep electricity bills lower. The inverter technology means the compressor runs more smoothly, which also improves energy use and reduces wear. This model offers five modes—including cooling, heating, dry, fan, and auto—plus multiple fan speeds, sleep mode, and eco mode, making it flexible for year-round comfort.

Noise-wise, it runs at around 53 decibels, which is noticeable but not overly loud; it might be slightly distracting in very quiet rooms but generally tolerable during normal use. The unit comes with useful extra features like a self-cleaning function, washable filters, and auto-defrost for the outdoor part, which helps with maintenance and prolongs the unit's life.

Installation must be handled by a licensed HVAC professional, which is common for ductless systems but adds to upfront costs and effort. The unit uses the modern R32 refrigerant, which is better for the environment than older types. The included remote control is easy to use, and the timer and quiet display enhance convenience. This makes the COSTWAY unit a reliable, energy-saving mini split AC that also provides heating with good control options and environmental benefits, although the noise level might be noticeable in very quiet settings.

Rating
10.0
BTU (British Thermal Units)
Noise Level
Installation and Maintenance

Most important from
1181 reviews

BTU (British Thermal Units)
Delivers fast and effective heating and cooling, making spaces comfortable quickly whether in a garage or living room.
Noise Level
Operates quietly enough to not disturb sleeping toddlers, even in open living spaces.
Installation and Maintenance
Installation requires professional help but is straightforward with clear instructions and manageable unit size.
Additional Features
Smart features like Alexa compatibility and a remote control add convenience to everyday use.

Buying Guide for the Best Wall Mounted Ductless AC Units

Choosing the right wall-mounted ductless AC unit can significantly improve your comfort at home or in the office. These units are known for their efficiency, ease of installation, and ability to cool specific areas without the need for extensive ductwork. To make an informed decision, it's important to understand the key specifications and how they relate to your needs. Here are the main specs to consider when selecting a wall-mounted ductless AC unit.
BTU (British Thermal Units)BTU measures the cooling capacity of the AC unit. It's important because it determines how effectively the unit can cool a given space. Units with lower BTU ratings (5,000-12,000 BTU) are suitable for small rooms or spaces up to 400 square feet. Medium BTU ratings (12,000-24,000 BTU) are ideal for larger rooms or spaces up to 800 square feet. Higher BTU ratings (24,000 BTU and above) are best for very large areas or multiple rooms. To pick the right BTU rating, consider the size of the area you need to cool and any factors that might affect cooling efficiency, such as ceiling height, insulation, and the number of windows.
Energy Efficiency Ratio (EER)EER indicates how efficiently the AC unit uses energy to cool your space. A higher EER means better energy efficiency, which can lead to lower electricity bills. EER values typically range from 8 to 12. Units with an EER of 10 or higher are considered energy-efficient. To choose the right EER, consider your priorities for energy savings and environmental impact. If you want to minimize your energy consumption and reduce costs, opt for a unit with a higher EER.
SEER (Seasonal Energy Efficiency Ratio)SEER measures the overall efficiency of the AC unit over an entire cooling season. It's important because it provides a more comprehensive view of the unit's energy performance. SEER ratings usually range from 13 to 25. Units with higher SEER ratings (18 and above) are more efficient and can save you more money in the long run. To pick the right SEER rating, consider how often you'll be using the AC unit and your long-term energy savings goals. Higher SEER ratings are ideal for frequent use and long-term savings.
Noise LevelNoise level indicates how loud the AC unit will be while operating. It's important for maintaining a comfortable and quiet environment. Noise levels are measured in decibels (dB), with lower values indicating quieter operation. Units typically range from 30 dB (very quiet) to 60 dB (moderate noise). To choose the right noise level, consider where the unit will be installed and your tolerance for noise. If you need a quiet environment, such as a bedroom or office, opt for a unit with a lower noise level.
Installation and MaintenanceInstallation and maintenance refer to how easy it is to set up and care for the AC unit. It's important because it affects the overall convenience and longevity of the unit. Some units come with easy-to-follow installation guides and require minimal maintenance, while others may need professional installation and regular upkeep. To choose the right unit, consider your comfort level with DIY projects and your willingness to perform maintenance tasks. If you prefer a hassle-free experience, look for units with straightforward installation and low maintenance requirements.
Additional FeaturesAdditional features can enhance the functionality and convenience of the AC unit. These may include remote control, programmable timers, sleep modes, and air purifiers. It's important to consider these features based on your specific needs and preferences. To choose the right unit, think about which features will improve your comfort and ease of use. For example, if you want to control the unit remotely or set it to turn on/off at specific times, look for models with these capabilities.

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