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 Senville SENA-30HF/T is a tri-zone mini split air conditioner with a strong cooling capacity of 28,000 BTU (2.3 tons), making it suitable for cooling multiple rooms up to around 1500 square feet. Its SEER rating of 23 indicates excellent energy efficiency, which can help reduce electricity bills. With three indoor air handlers, each room can have its own temperature control, providing comfort tailored to different spaces.

Noise level is impressively low at 25 decibels, making it very quiet — ideal for bedrooms or offices where minimal sound is important. The unit works with Alexa, allowing for convenient voice or app control, and you can set routines for energy savings when you're away. Installation requires a professional since it’s a split system with an outdoor condenser and indoor units, and the kit comes with some necessary parts like a 16-foot line set.

The product features solid durability backed by a 10-year warranty on the compressor and 5 years on parts, plus free technical support. Although installation may be more complex and involve higher upfront costs due to the need for professional setup, it suits homeowners or small businesses seeking efficient, quiet multi-room cooling with smart controls.

The MRCOOL 12000 BTU Ductless Inverter Mini Split is a solid choice if you need both cooling and heating in a single unit, covering spaces up to around 550 square feet. With 12,000 BTUs, it’s suitable for small to medium rooms like bedrooms, small offices, or compact commercial areas. It operates quietly at about 43 decibels, which is comparable to a quiet conversation, making it unobtrusive during use. The 2-star energy rating suggests it’s moderately efficient, so it won’t be the lowest on energy bills but still reasonable for the price.

One of its strong points is the DIY-friendly design, making installation easier for those comfortable with some basic setup, and it includes helpful maintenance features like easy-to-clean filters and refrigerant leak detection to keep it running smoothly. Extra perks like timer mode and Active Clean Technology help maintain good air quality and convenience. However, if you expect ultra-low noise or top-tier energy efficiency, there might be better options, and it only supports a single zone, so it’s not ideal if you want to cool or heat multiple rooms independently.

This model is well-suited for users seeking a straightforward, year-round HVAC solution without complex installation or multi-zone needs.