10 Best Diy Mini Split 2025 in the United States

The Senville LETO Series Mini Split is a 1.5-ton (18,000 BTU) unit designed for cooling and heating spaces up to about 1,000 square feet. It offers a high SEER rating of 19, which means it runs efficiently and can help lower energy bills compared to less efficient models. This single-zone system is ideal if you need to control the temperature in one room or a focused area. One of its standout features is the inverter technology, which adjusts compressor speed to maintain steady comfort and save energy. It’s also Alexa-enabled, allowing control through voice commands or an app, which adds convenience but might be less important if you prefer simple manual controls.

This mini split is quiet, operating at around 30 decibels—comparable to a whisper—so it won’t disturb your daily activities or sleep. It includes heating capability with a heat pump that works effectively down to about 5°F (-15°C), making it suitable for moderate winter climates but potentially less ideal for extremely cold areas. The package comes with everything needed for installation, including a 16-foot line set pre-charged with refrigerant, but professional installation is recommended since DIY setup can be complex. The unit’s design is clean and unobtrusive, fitting well in most homes or small businesses.

Warranty coverage is solid, offering 5 years on the compressor and parts, giving peace of mind on durability. One downside is that it isn’t Energy Star certified, which might matter if you’re strictly looking for the highest environmental standards. Also, its single-zone setup means it won’t work if you need to cool or heat multiple rooms independently. This Senville model suits homeowners or small business owners looking for a reliable, energy-efficient, and quiet mini split with smart features, as long as they’re comfortable with professional installation and don’t require multi-zone control.

The COSTWAY 18000 BTU Mini Split Air Conditioner & Heater is designed to cool and heat rooms up to about 1250 square feet, making it a solid choice for medium-sized living spaces. It features a 19 SEER rating, which means it is quite energy efficient and can help reduce electricity bills compared to less efficient units. The unit uses an advanced inverter compressor, so it adjusts power smoothly without constantly turning on and off, helping prolong its lifespan and save energy. It operates at around 56 decibels, which is moderately quiet—similar to a normal conversation—but quieter units do exist if you need something ultra-silent.

This model supports heating with a heat pump function, so it can provide warmth in colder months as well. The system is a single-zone, wall-mounted split system, which means it has an indoor unit and an outdoor unit and requires professional installation. It uses the eco-friendlier R32 refrigerant, which is better for the environment than older types. Additional features include multiple modes for comfort (cooling, heating, dry, fan), a remote control, self-cleaning function, and an auto-defrost feature for the outdoor unit.

Installation requires a licensed technician, but the product comes with a strong warranty covering parts and the compressor. This mini-split is a good fit if you want an all-in-one heating and cooling solution with energy-saving benefits and solid performance for a medium-sized room.

The Senville LETO Series Mini Split is a solid choice if you're looking to install a single-zone heating and cooling system yourself or with professional help. It delivers 12,000 BTUs (about 1 ton), which is suitable for medium-sized rooms like bedrooms or small living areas. Its SEER rating of 19 indicates good energy efficiency, helping save on electricity bills compared to less efficient units, although it is not Energy Star certified.

This system is versatile, offering cooling, heating (effective down to about 5°F or -15°C), dehumidifying, and fan functions, making it a year-round climate solution. One standout feature is its Alexa compatibility, allowing you to control temperature settings with voice commands or an app, adding convenience to daily use. The unit comes with an installation kit including a 16-foot line set pre-charged with refrigerant, but professional installation is recommended as it involves handling refrigerant and electrical connections.

Noise levels are generally low for mini splits, making it suitable for bedrooms or quiet spaces. A 5-year warranty on parts and compressor offers peace of mind. The white, compact design fits nicely in many room styles without standing out. If you want a reliable, energy-efficient mini split with smart control and decent heating ability for mild to moderate climates, the Senville LETO is worth considering. However, if you need Energy Star certification or plan multiple zones, you might want to explore other options.