10 Best Mini Split Air Conditioners 2025 in the United States

The COSTWAY 23000 BTU Mini Split Air Conditioner is a solid choice if you need to cool or heat a large space up to about 1500 square feet. Its powerful 23000 BTU capacity and 17 SEER rating mean it delivers efficient performance, which helps keep energy bills reasonable while still providing strong cooling and heating, even in extreme temperatures (up to 122℉ for cooling and as low as 5℉ for heating). It uses R32 refrigerant, which is better for the environment compared to older types. You get one zone for a focused climate control area, which works well in a single large room or open-plan living space. The noise level is relatively low at 37 decibels, so it won't disturb your daily activities or sleep, especially with its quiet sleep mode.

Installation requires a licensed HVAC professional, which adds to the upfront cost and complexity—something to consider if you want a simpler setup. A standout feature is the Wi-Fi connectivity, letting you control your AC remotely via smartphone or voice commands with Alexa or Google Assistant, adding convenience. The unit also offers multiple modes and fan speeds, plus features like auto swing and self-cleaning filters that help with maintenance and air quality.

The unit is fairly heavy at over 100 pounds, and while installation parts are included, professional help is necessary. This model is ideal for homeowners who want reliable, smart-controlled climate comfort for a large space and are comfortable with professional installation and maintenance.

The COSTWAY 12000 BTU Mini Split Air Conditioner & Heater is a solid choice for cooling and heating rooms up to about 750 square feet. Its 1-ton capacity with a high SEER2 rating of 20 means it uses energy efficiently, helping to keep electricity bills lower than many older models. This unit is a ductless mini-split, designed for wall mounting, and supports single-zone use, which suits individual rooms or small open spaces well.

A key strength lies in its inverter technology and heat pump, allowing for both cooling in summer and heating in winter, with smooth power adjustments that reduce wear and save energy. It offers five modes including auto, cool, dry, heat, and fan, plus useful features like sleep and ECO modes for comfort and efficiency. The included remote control and timer make operation easy and convenient. Noise is fairly low at 51 dB, which is reasonable for this type but may still be noticeable in very quiet rooms. Installation isn’t DIY-friendly; it requires a licensed HVAC professional due to the pre-charged refrigerant and technical setup, which might increase upfront costs.

Maintenance is simplified with a self-cleaning function and washable filters, helping keep the air fresh and the system running smoothly. Additional benefits include an environmentally friendlier R32 refrigerant and solid warranty coverage—5 years for parts and 8 years for the compressor—giving peace of mind. This COSTWAY mini split suits homeowners wanting efficient, year-round climate control in a moderate-sized space, balancing energy efficiency, quiet operation, and versatile settings, though professional installation and moderate noise levels are factors to consider before purchase.

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.