10 Best Mini Split Air Conditioners 2025 in the United States

The TOSOT TST-MZ-M36-D1818 is a dual-zone mini-split air conditioner and heat pump designed to cool and heat up to about 2,400 square feet efficiently. Its combined 36,000 BTU capacity, split into two 18,000 BTU indoor units, allows you to control temperatures separately in two rooms, which is great if you want personalized comfort. With a high SEER2 rating of 21, this unit is very energy-efficient, helping you save on electricity bills compared to standard models. It's also Energy Star certified and qualifies for federal tax rebates, which adds to its cost benefits. The system operates quietly at 63 decibels, though this noise level is moderate and might be noticeable in very quiet spaces.

Installation is more straightforward than traditional central AC as it requires no ductwork, and it comes with a 16.4-foot copper line set, although you’ll need to get the power cord separately. Maintenance is relatively simple since each indoor unit can be serviced individually. The unit handles extreme weather well, operating efficiently even in very cold or hot climates, which is useful if you live in areas with harsh seasons. You can control the system remotely via WiFi through an app, including voice commands with Google Assistant, adding convenience.

The size and weight (over 300 pounds) might require professional help during installation. Also, the product is shipped in multiple packages, so make sure you have all parts before arranging installation. With a five-year warranty, this system offers solid reliability and smart home compatibility, making it a strong choice if you need flexible cooling and heating for two rooms with good energy savings.

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.