10 Best Quietest Air Conditioner 2025 in the United States

The BLACK+DECKER Smart Portable Air Conditioner with Heat offers a mixed bag of features for those looking for a quiet and efficient cooling and heating solution. One of its strong points is its versatility, functioning as a 4-in-1 unit that can cool, heat, dehumidify, and act as a fan, making it suitable for year-round use. With a cooling capacity of 10,000 BTU (DOE) and heating capacity of 10,000 BTU, it's designed for rooms up to 700 sq. ft., which covers a decent-sized area.

The device is also smart-enabled, allowing you to control it via a mobile app or through voice commands using Amazon Alexa or Google Assistant, which adds convenience for tech-savvy users. It also features a 'Follow Me' remote control, providing precise temperature control based on the remote's location. However, there are some drawbacks. The noise level is 54 dB, which while not extremely loud, may not be the quietest option available on the market—something to consider if noise is a top priority. The Seasonal Energy Efficiency Ratio (SEER) is 6.2, which is on the lower side, meaning it may not be the most energy-efficient choice. Additionally, it's not Energy Star rated, so it might not offer the best energy savings.

Installation is relatively straightforward with the included window kit, making it easy to set up, but keep in mind that it's a portable unit and might take up some floor space. Weighing 35 pounds, it's relatively easy to move around. This unit could be a good fit for those who need a versatile, smart-enabled air conditioner and heater, but if you need the quietest and most energy-efficient option, you might want to explore further.

The Daikin 24,000 LV Series Mini Split Heat Pump is a strong candidate for anyone seeking a quiet and efficient air conditioning solution. It operates at a low noise level of 37 decibels, which is quieter than many traditional AC units, making it ideal for bedrooms, offices, or living spaces where minimal noise is important. With a cooling capacity of 21,400 BTUs, it can comfortably cover up to 1,460 square feet, suitable for medium to large rooms or open areas. Its high energy efficiency rating of 19.5 SEER2 means it uses electricity wisely, potentially saving you money on energy bills compared to less efficient models. The inverter technology helps maintain consistent temperatures without frequent on-off cycles, improving comfort and further reducing noise.

The system includes multiple fan features such as customizable air direction and 3D airflow, enhancing comfort by distributing air evenly. Installation is of the split system type, which requires mounting an indoor unit and placing the outdoor condenser outside, usually involving professional installation. This setup is great for spaces where ductwork is impractical. While very efficient, this unit is not Energy Star rated, which some buyers specifically look for. Also, despite its quiet operation, 37 dB may still be noticeable in very quiet environments. The included installation kit is a plus for easier setup, but the system weighs 190 pounds, which might be a consideration for mounting and installation.

This Daikin model combines quiet performance with strong cooling power and energy efficiency, making it well-suited for those wanting a reliable, low-noise air conditioner for medium to large spaces.

The Daikin 18,000 BTU LV Series mini-split is a solid choice if you're looking for a quiet, energy-efficient air conditioner for spaces up to about 1,000 square feet. It operates at a low noise level of just 37 decibels, which is quieter than many traditional window or central AC units, making it great for bedrooms, offices, or living rooms where peace is important. Its cooling power is strong enough to handle medium to large rooms comfortably, with the added benefit of heating capability, so it works year-round.

The unit uses advanced DC inverter technology, which helps it adjust its power smoothly for efficient energy use, reflected in its high 19.5 SEER2 rating—this means lower electricity bills compared to older or less efficient models. Installation requires a wall-mounted split system setup, which is more flexible and less intrusive than ducted systems, perfect for homes without existing ductwork or where installing ducts would be difficult. The system includes helpful features like remote control, customizable airflow, and an air-purifying filter for better indoor air quality.

It is important to note that while the unit is quiet and efficient, it might involve professional installation and the upfront cost can be higher than simpler window units. Also, it’s designed for specific room sizes, so oversizing or undersizing could affect performance. For those seeking a quiet, energy-smart solution that cools and heats efficiently with modern features and are comfortable with installation requirements, this Daikin mini-split is a strong contender.