10 Best Smallest Mini Split Air Conditioner 2025 in the United States

The Della Versa Series 12000 BTU Mini Split Air Conditioner is designed to efficiently cool and heat spaces up to 750 square feet, making it a solid choice for medium-sized rooms. With a high SEER of 19, it excels in energy efficiency, which can lead to lower energy bills over time. Its heating capability is impressive as it can operate in temperatures as low as -4℉, making it suitable for colder climates. The unit includes a variety of smart features such as auto defrost, sleep mode, and a smart sensor that adjusts temperature based on remote placement, allowing for personalized comfort.

In terms of noise, its operation is notably quiet, ranging from 30-41 dBa, which is a significant advantage for those sensitive to sound, especially during the night. However, the requirement for professional installation can be a drawback for users who prefer DIY projects or are looking to save on installation costs. The installation process also demands line-set vacuuming and adjustments to freon levels if modified, which adds to the complexity.

While the installation kit is included and covers a decent distance, the 16.4 ft length may not be sufficient for all configurations, potentially requiring additional materials. The unit's weight at 76 pounds also indicates that handling and installation may require more than one person. This mini-split air conditioner is a strong contender in its category, offering efficient cooling and heating with smart features, but it comes with specific installation needs that some users may find challenging.

The Senville LETO Series Mini Split Air Conditioner is a solid choice for anyone looking for an efficient cooling and heating solution for medium to large spaces, covering up to 1,000 square feet. With a cooling power of 18,000 BTU and a high SEER rating of 19, this mini-split is energy-efficient, which can help save on utility bills over time. Its noise level is impressively low at 30 dB, making it suitable for bedrooms or quiet environments. The 4-in-1 functionality allows it to not only cool but also heat, dehumidify, and circulate air, adding versatility to its use throughout the year.

A big plus is the smart features, including Alexa compatibility, which means you can control the unit via voice commands or an app, adding convenience to your daily life. The stylish design allows it to blend in well with home or business settings without looking out of place.

However, there are some considerations to keep in mind. The unit requires professional installation, which could add to the overall cost if you don’t have someone on hand. While the warranty covers parts and compressor for five years, labor isn’t included, which might lead to additional expenses if repairs are needed. Another point to note is that it’s not Energy Star compliant, which may be a drawback for those specifically seeking high efficiency credentials.

The COSTWAY 12000BTU Mini Split Air Conditioner & Heater is a versatile and energy-efficient option for spaces up to 750 sq. ft. It boasts a high SEER rating of 20, making it an effective choice for reducing energy consumption. The unit also includes a heat pump, allowing it to provide comfort throughout the year, whether cooling in the summer or heating in the winter. With a noise level of 51 dB, it operates relatively quietly, though it might not be the quietest option available.

Installation flexibility is a strong point, thanks to its wall-mounted, ductless design, but it requires a licensed HVAC installer for setup, which could be a drawback for some users. The smart features like the handy remote control, programmable timer, and sleep mode add to the convenience, while the self-cleaning and auto-defrost functions ensure longevity and ease of maintenance.

However, the need for professional installation and the initial cost might be considerations for budget-conscious buyers. In short, this unit is ideal for those looking for an efficient, all-in-one solution for year-round climate control in a mid-sized room, provided they are prepared for the installation requirements.