10 Best Portable Mini Split Air Conditioners 2025 in the United States

The Senville LETO Series Mini Split Air Conditioner Heat Pump is a versatile and efficient unit designed for cooling and heating spaces up to 400 square feet. With a cooling capacity of 9000 BTU and a high Seasonal Energy Efficiency Ratio (SEER) of 21.5, it promises to be energy-efficient, though it is not Energy Star compliant. One of its standout features is the compatibility with Alexa, allowing for convenient voice control and remote adjustments through an app, making it user-friendly for tech enthusiasts.

The 4-in-1 functionality (including air conditioning, heat pump, dehumidifier, and fan) adds to its versatility, making it suitable for year-round use. Its quiet operation at 25 dB is ideal for bedrooms and living spaces, ensuring minimal disturbance. The installation kit includes everything needed, but professional installation is required, which could be seen as a drawback for those looking for a DIY solution. The unit is backed by a solid warranty, offering 5 years on parts and the compressor, though labor costs are not covered.

Despite not being Energy Star certified, it remains an efficient choice for those looking to maintain comfort in their homes or small commercial spaces. The Senville LETO Series offers a blend of advanced features, energy efficiency, and quiet operation, making it a strong contender in the portable mini-split air conditioner market.

The COSTWAY 12000BTU Mini Split Air Conditioner & Heater is a strong choice if you’re looking to cool or heat a medium-sized room up to about 750 sq. ft. Its 12000 BTU cooling capacity is suitable for most living rooms or bedrooms. One of its standout features is the high energy efficiency, boasting a SEER2 rating of 20 and an EER2 of 10, which means it uses less electricity compared to many other units, helping to save on energy bills. It also operates quietly at around 51 dB, so it won’t disturb your sleep or daily activities.

The unit offers versatile comfort with 5 modes including auto, cool, dry, heat, and fan, plus multiple fan speeds and special functions like sleep mode and turbo cooling. It uses inverter technology that adjusts power use smoothly without frequently turning the compressor on and off, which also extends the unit’s lifespan. Additional handy features include a self-cleaning function to keep the air fresh and an auto-defrost for winter efficiency.

On the installation side, this mini-split system is wall-mounted and not truly portable. It requires professional installation by a licensed HVAC technician, which is important to consider if you want a quick setup or plan to move it often. The unit weighs 83 pounds, so it’s not light to handle yourself. However, the package comes with most components needed for installation and a user-friendly remote control for convenient operation. This air conditioner suits those who want an energy-efficient, quiet, and reliable mini-split system for year-round use in medium-sized spaces. It’s less ideal if you want a truly portable or DIY-install unit, due to its weight and professional installation needs.

The COSTWAY 18,000 BTU Mini Split Air Conditioner is a solid choice for anyone needing efficient cooling and heating in spaces up to about 1,250 square feet. Its cooling power of 17,000 BTU (close to the advertised 18,000) is strong enough for medium to large rooms, making it suitable for homes or offices. It also includes a heat pump capable of heating, which adds year-round comfort with four modes: cool, heat, dry, and fan. One of its biggest advantages is its high energy efficiency, boasting a 21 SEER2 rating and Energy Star Most Efficient 2024 certification, which means it uses less electricity than many other models, helping reduce power bills. The inverter technology adjusts compressor speed smoothly, avoiding frequent stops and starts, which is both energy-saving and beneficial for maintaining a steady temperature.

Noise-wise, it operates at around 49 dB, which is moderate and similar to a quiet conversation, so it won't be too disruptive indoors. Installation requires a licensed HVAC professional, as it's a split system with indoor and outdoor units connected by copper piping; this means it’s less portable in the sense of easy DIY moves, but once installed, it runs very efficiently and quietly. The unit also features useful extras like a remote control with a good range, a 24-hour timer, turbo mode for fast cooling, and a self-cleaning function that helps reduce maintenance and improve air quality. Although the package includes everything needed for installation, you should budget for professional setup.

This mini split is well suited for someone looking for an energy-efficient, quiet, and versatile heating and cooling solution for a fairly large space, with the understanding that it’s a semi-permanent installation rather than a truly portable option.