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 Della 27K BTU Dual Zone Air Conditioner & Heat Pump is a powerful unit designed to cool and heat up to 2000 sq. ft. It offers a substantial 27,000 BTU cooling capacity, split between two 18,000 BTU indoor units, making it effective for multiple rooms. With an impressive SEER rating of 19, it boasts high energy efficiency, potentially reducing power consumption by up to 30% due to its DC Inverter technology. The unit operates quietly at 50 dB, which is relatively low for air conditioners, ensuring minimal disruption in your living space.

The multiple fan speeds and smart functions like 4D airflow, sleep mode, and eco energy-saving mode enhance user convenience and comfort. Additionally, it integrates well with modern smart home setups, being Alexa and WiFi enabled. Despite its benefits, the installation is complex and requires professional assistance, which might be a drawback for those seeking a DIY solution. The unit also includes remote control for ease of use, but its heavy weight (178.7 pounds) might pose challenges during installation.

Ideal for users needing efficient climate control across multiple rooms and who are willing to invest in professional installation for optimal performance.

The Della 36K BTU Dual Zone Mini Split Air Conditioner is a powerful cooling unit capable of cooling up to 2050 sq. ft. It comes with two indoor handlers of 12,000 BTU and 24,000 BTU each, offering personalized climate control for different rooms. This unit is energy efficient with a SEER2 rating of 19, which means it can save up to 30% on power usage. It operates quietly at 51 dB, making it a good choice for those sensitive to noise.

The air conditioner also includes a variety of smart features like WiFi and Alexa compatibility, multiple fan speeds, 24-hour timer, sleep mode, and eco energy-saving mode. However, it requires professional installation and line-set vacuuming during setup, which might be a downside for those looking for a DIY solution. This product is ideal for anyone looking for an efficient, quiet, and versatile air conditioning solution for large spaces and multiple rooms.