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 Air Conditioner Heat Pump offers a versatile solution for both cooling and heating with a 9000 BTU rating, making it suitable for rooms up to 400 square feet. One of its standout features is the high SEER2 rating of 21.5, indicating excellent energy efficiency. This unit is also Alexa-enabled, allowing for convenient voice control and remote adjustments via an app, which adds to its user-friendly appeal. However, it's important to note that despite being labeled as a DIY mini-split, the installation does require professional assistance, which may add to the cost and complexity for some users.

The noise level is remarkably low at 25 dB, ensuring a quiet operation suitable for bedrooms or living areas. Additionally, the unit functions effectively as an air conditioner, heat pump, dehumidifier, and fan, offering year-round comfort. The included installation kit with a 16ft line set is comprehensive, but users should be aware that the refrigerant is only pre-loaded for up to 25 feet, which could limit placement options.

The 5-year warranty on parts and the compressor provides peace of mind, though labor is not included. This product might be most appealing to those looking for a stylish, multi-functional mini-split system with smart capabilities, who do not mind the need for professional installation.