10 Best Mini Split Air Conditioners 2025 in the United States

The MRCOOL DIY 24K BTU 4th Gen mini-split air conditioner is designed for single-zone cooling needs, ideal for spaces around 1000 square feet. With a cooling capacity of 24,000 BTU (2 tons), it can efficiently cool medium to larger rooms. Its standout feature is a high SEER rating of 20.5, which means it uses energy very efficiently, helping reduce electricity bills compared to less efficient models. The unit operates quietly at 33 decibels, making it suitable for bedrooms or living areas where low noise is important.

One of the biggest advantages is the easy DIY installation, thanks to pre-charged quick connect line sets — no special tools or professional help required, which can save you on installation costs. It also offers smart control via Apple or Android devices, allowing you to adjust settings remotely. Additional useful features include leakage detection to protect the compressor and a low ambient cooling mode that works even in colder weather down to 5°F. However, it is limited to a single zone, so if you want to cool multiple rooms separately, this model might not meet that need. Also, the unit is fairly large and heavy, which might require careful planning for wall mounting.

Its Energy Star certification ensures reliable efficiency. This mini-split represents a strong option for those seeking a powerful, energy-efficient, and user-friendly cooling solution for one main living space.

The MRCOOL DIY 9,000 BTU mini-split air conditioner and heat pump is designed for rooms up to 350 square feet, making it suitable for small to medium spaces like bedrooms, offices, or small living areas. It offers both cooling and heating, allowing for year-round comfort. With a SEER rating of 23.6, it is quite energy-efficient, helping reduce electricity bills compared to older units. The noise level is 45 dB, which is fairly quiet—about the sound of a soft conversation—so it won’t be disruptive in most settings.

One of its biggest advantages is the DIY installation: MRCOOL provides a pre-charged, quick-connect line set, so you don’t need special tools or professional help, saving on installation costs and time. The unit also includes smart features like WiFi control compatible with Google Assistant and Alexa, allowing you to adjust settings remotely, plus sleep mode and a dehumidifier function for added comfort. However, its 1-star BEE rating indicates it may not meet the highest efficiency or environmental standards in some regions.

While the 9,000 BTU capacity is perfect for smaller spaces, it won’t cool or heat larger rooms effectively. The product weighs 145 pounds, which is something to consider during installation. This mini-split is a good pick if you want a quiet, energy-efficient system with heating and cooling in a compact size, especially if you prefer a simple do-it-yourself setup without needing professional installation.

The TOSOT 24,000 BTU Mini-Split Air Conditioner and Heating System is a solid choice for cooling and heating spaces up to around 1500 square feet. Its 24,000 BTU capacity suits medium to larger rooms well. With a SEER2 rating of 19 to 22, it is energy-efficient, helping you save on electricity bills while providing reliable temperature control. It operates quietly between 22 and 36 decibels, making it a good fit for bedrooms, offices, or any place where low noise is important.

This model supports WiFi and voice control through the Gree+ app, allowing for easy remote adjustments without needing to be near the unit. This is a convenient feature for modern smart homes. The unit includes a 16-foot copper line set which simplifies installation, but since it is a single-zone system, it is designed to cool or heat one room or area at a time. Installation and maintenance require professional help, which is common for mini-splits but something to keep in mind. One minor inconvenience is that the unit might arrive in multiple packages, so you’ll need to ensure all parts are received before starting installation.

The system is also designed to work efficiently in a wide temperature range, cooling well even when it's very hot outside and heating effectively when it's cold. Backed by a 5-year warranty, it offers peace of mind for durability. If you want a quiet, energy-saving, and smart-controlled mini-split for one main living area, this TOSOT Cosmo model fits the bill well. However, if you need to cool or heat multiple zones or rooms, you might want to look into a multi-zone system instead.