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 Diamante Essenza 35,000 BTU mini-split is a solid choice if you need a strong cooling and heating solution for medium to large rooms or multiple zones in your home. Its 3-ton capacity means it can handle spaces that require significant temperature control. With a SEER rating of 17, it offers good energy efficiency compared to many older or less efficient models, helping keep electricity bills reasonable. The inverter compressor technology is a big plus because it adjusts power smoothly to maintain your desired temperature without wasting energy on frequent on/off cycles.

Noise-wise, this unit is impressively quiet at 39 decibels, making it one of the better options for bedrooms, nurseries, or home offices where low noise is important. Its compact high-wall design is sleek and unobtrusive, blending well into most rooms without bulky vents or ducts. Installation is fairly straightforward since it comes factory-charged and includes a 16-foot installation kit, which should cover typical setups, although longer distances might need extra parts.

It should be noted that this is a single-zone unit, so if you want to control multiple rooms independently, you’ll need additional units. Also, while it runs on 230 volts, you should confirm your home’s electrical system compatibility before purchasing. The product has solid user feedback with a 4.4-star rating, suggesting good reliability and satisfaction. If you want an efficient, quiet, and easy-to-install mini-split with strong cooling and heating power for a single zone, the Diamante Essenza 35,000 BTU model is a dependable pick. Just be mindful of your space size, electrical setup, and whether you need multi-zone control.