10 Best Mini Split Units 2025 in the United States

The MRCOOL 36,000 BTU 5th Gen DIY Mini Split is a strong choice for cooling and heating spaces up to about 1,550 square feet, making it suitable for larger rooms, offices, or small commercial areas. Its 18 SEER rating indicates good energy efficiency, which helps reduce electricity bills during use. The noise level of 46 decibels is fairly quiet, so it won't be disruptive in a home or office environment. This model supports one zone, meaning it controls temperature in a single area rather than multiple separate rooms. A major plus is the easy DIY installation with pre-charged, quick-connect line sets that don’t require professional skills or special tools, saving money on setup. It also comes with smart controls compatible with Alexa and Google Assistant, making temperature adjustments convenient.

The unit combines cooling, heating, and dehumidifying features, so it works year-round and improves indoor comfort. It operates on 230 volts and is fairly heavy at 180 pounds, which might require some help during installation. The product offers a solid warranty (5 years parts, 7 years compressor), adding peace of mind. If you want a user-friendly, energy-smart mini split with strong capacity and easy setup for a single zone, this MRCOOL model fits well. However, if you need multi-zone control, you might want to explore other options.

The COSTWAY 9000 BTU mini split is a solid choice for cooling and heating rooms up to about 450 square feet. Its 17 SEER rating means it’s fairly energy efficient, helping keep electricity bills lower compared to older or less efficient models. The unit also has a heat pump with inverter technology, which adjusts power smoothly to save energy and reduce wear on the compressor. This model offers five operation modes including cool, heat, dry, fan, and auto, plus four fan speeds—giving good flexibility for year-round comfort. Noise-wise, it runs at about 53 decibels, roughly the sound level of a quiet conversation, so it’s not silent but shouldn’t be too disruptive in most living spaces. With only one zone (meaning it cools or heats one area), it’s best suited for single rooms or small apartments rather than multi-room setups.

Installation requires a licensed HVAC professional, which adds to cost and complexity but ensures the system works properly and is safe. Maintenance is user-friendly thanks to a washable filter and a self-cleaning feature that reduces buildup inside. Plus, the unit uses the eco-friendly R32 refrigerant, which has less environmental impact than older types. The included remote and timer functions add convenience for daily use. While it’s not the quietest or highest capacity mini split available, this COSTWAY model combines good energy efficiency, year-round functions, and straightforward maintenance. It is a practical pick for anyone needing reliable heating and cooling in a moderately sized room and who prefers an environmentally conscious option.

The Senville LETO Series Mini Split offers a solid 18,000 BTU cooling capacity, making it a good fit for medium-sized rooms up to about 1,000 square feet. With a SEER rating of 19, it promises energy-efficient operation, which helps keep electricity bills lower during use. It also works as a heat pump effectively down to 5°F, adding year-round comfort with heating and cooling options. This model supports a single zone, meaning it can control temperature in one room or area at a time. Noise level is very low at about 30 dB, so it won’t disturb your daily activities or sleep.

The unit includes an installation kit and refrigerant for up to 25 feet of line set, but professional installation is recommended for safety and performance reasons. One interesting feature is its Alexa compatibility, allowing smart home integration for easy voice or app control. However, the system is not BEE star rated, which might be a consideration if you prioritize eco-labels. The warranty covers parts for 2 years and the compressor for 5 years, providing decent peace of mind for long-term use.

Though the price and installation requirements may be a bit higher than window units or simpler models, this mini split is a versatile and quiet option that combines modern smart features with reliable cooling and heating in one package.