10 Best Coldest Air Conditioner 2025 in the United States

The BLACK+DECKER Smart Portable Air Conditioner with Heat offers a decent cooling capacity of 10,000 BTU DOE (14,000 BTU ASHRAE 128) which is effective for rooms up to 375 square feet. However, the unit claims to be suitable for areas up to 700 square feet, which might be optimistic for optimal performance. The added heating function with 12,000 BTU makes it versatile for year-round use. It includes a smart control feature with Wi-Fi connectivity, allowing control via mobile app and voice commands with Amazon Alexa or Google Assistant, adding convenience for tech-savvy users. The 'Follow Me' remote control enhances temperature accuracy by acting as a thermostat.

Energy efficiency is on the lower side with a SEER of 6.2 and it is not Energy Star rated, which may result in higher energy bills. The noise level of 54 dB is relatively standard for portable units, but may still be noticeable, especially during nighttime. The unit's design includes an easy-to-install window kit, making setup straightforward. Weighing 35 pounds, it's fairly portable and does not require assembly.

This air conditioner would be suitable for those looking for a portable, versatile unit with smart features, best used in moderately sized rooms rather than large spaces.

The Dreo Portable Air Conditioner offers a solid 12,000 BTU cooling capacity, suitable for rooms up to about 300 square feet, which means it can handle typical bedrooms or small living areas comfortably. It provides adjustable cooling between 65°F and 86°F, giving you good control over your room temperature. The energy efficiency ratio (SEER) is 6.1, which is average for portable AC units, so it won’t be the most energy-saving model but should keep electricity use reasonable.

One of its standout features is the quiet operation at 46 decibels, thanks to noise isolation technology around the compressor. This low noise level makes it a great choice for bedrooms or offices where you want cooling without distraction. It also includes three modes: cooling, fan, and dehumidifier, offering versatility beyond simple cooling. The built-in dehumidifier helps remove moisture in humid conditions up to 85% humidity, which can improve comfort. The drainage-free cooling design is convenient because it reduces the need to manually remove water, unlike many portable ACs that require frequent emptying. Installation is straightforward with universal window kits fitting a variety of window sizes, adding to its user-friendliness.

Smart controls are another plus, allowing you to use voice commands through Alexa or Google Assistant or control the unit via the Dreo app, including setting timers and fan speeds. While the energy efficiency is not particularly high, it offers strong cooling power and quiet operation. The unit’s size is somewhat bulky for a portable model, so space could be a consideration. This versatile, easy-to-use portable air conditioner is well suited for bedrooms or small rooms, offering useful smart features and hassle-free maintenance, making it a reliable choice for those wanting effective and flexible cooling.

The DELLA Versa Series 12000 BTU Mini Split Air Conditioner is a powerful and energy-efficient option for cooling and heating spaces up to 550 sq. ft. It boasts a high cooling capacity of 12000 BTU, which is suitable for medium-sized rooms. Its impressive Energy Efficiency Ratio (SEER2) of 19 reflects its ability to save energy, potentially reducing your electricity bills by up to 30%. The unit operates with ultra-quiet efficiency at just 42 dB, making it ideal for bedrooms or living areas where noise can be disruptive.

Additionally, it offers multiple fan speeds and several smart functions like 4D airflow, eco energy saving mode, turbo function, and sleep mode, ensuring user comfort and versatility. It also includes a heat pump that works even in low temperatures, adding to its utility in colder climates. Installation requires professional help, which might be a downside for those seeking a DIY solution.

The integration with Alexa and WiFi adds convenience, allowing remote control of the unit. However, the need for line-set vacuuming and alteration of freon levels during installation suggests it's not the simplest setup. This air conditioner is a robust and efficient choice for those looking for advanced features and quiet operation, although the installation complexity might be a consideration.