10 Best Quietest Air Conditioner 2026 in the United States

The Dreo Portable Air Conditioner is designed with quiet operation in mind, boasting a noise level of just 45 decibels, which makes it suitable for bedrooms or workspaces where minimal noise is important. With a cooling capacity of 10,000 BTU (ASHRAE rating) or 6,000 BTU (SACC), it can efficiently cool rooms up to around 200 square feet, fitting well for medium-sized bedrooms or offices. Its patented Noise Isolation System helps reduce compressor and fan noise, supporting a calm environment.

Energy efficiency is decent with a SEER rating of 6.51, which is average for portable ACs but not the highest available. This means it’s fairly economical to run but won’t save as much energy as some inverter-based models. The unit offers multiple fan speeds and modes including Cool, Fan, and Dry, letting you tailor airflow and humidity control. The smart features allow control via an app, voice assistants like Alexa and Google Home, and a remote, making it convenient and modern. One standout feature is the true drainage-free system that automatically evaporates condensation, reducing maintenance hassles.

Installation is user-friendly with caster wheels for easy movement and modular window panels that fit various window types. This portable design suits renters or those who want flexible cooling options without permanent installation. While the noise level is low, 45 dB is not whisper-quiet compared to some ultra-quiet models that go below 40 dB. The cooling capacity is limited to smaller rooms, so it may struggle in larger spaces. The lack of inverter technology might lead to higher energy consumption over time. This makes the Dreo Portable Air Conditioner a solid choice for those needing a quiet, easy-to-use cooling solution for small to medium rooms, especially bedrooms, with smart controls and drainage-free operation being key advantages.

The Midea 12,000 BTU U Shaped Smart Inverter Window Air Conditioner is a solid choice if you’re looking for a quiet and energy-efficient cooling option for spaces up to about 550 square feet. One of its standout features is the very low noise level—running as quietly as 32 decibels, which is much quieter than many traditional window AC units. This makes it a good fit for bedrooms, offices, or living rooms where a peaceful environment matters.

The unit uses advanced inverter technology, which not only contributes to low noise but also helps save over 35% on energy compared to non-inverter models, earning it an ENERGY STAR certification. This means it can cool efficiently while keeping electricity costs down. It offers smart controls via Wi-Fi and is compatible with Alexa and Google Assistant, so you can adjust settings easily from your phone or by voice commands. The unique U-shaped design allows you to keep your window partially open for fresh air and a better view, which is rare for window air conditioners.

Installation is straightforward with the included bracket fitting most single or double-hung windows. However, the unit is somewhat bulky and weighs nearly 59 pounds, so it might require two people to install it safely. It has multiple fan speeds and useful features like a dehumidifier and dust filter. This unit is an excellent option if quiet operation and energy savings are priorities, though you should ensure your window fits the size requirements and be prepared for a moderately heavy unit.

The Daikin 24,000 BTU Oterra R32 mini-split air conditioner is a strong choice if you're looking for quiet and efficient cooling and heating for spaces up to 1,500 square feet. With a noise level of just 39 decibels, it operates quietly enough to be unobtrusive, which is great for bedrooms, offices, or living areas. It uses inverter technology, allowing it to adjust cooling power smoothly, which not only saves energy but also helps keep noise levels low compared to traditional units.

This unit offers a cooling capacity close to 24,000 BTUs and a high 21 SEER2 efficiency rating, meaning it can cool effectively without driving up your electricity bills. It also provides heating, working well in a wide temperature range, which makes it useful for year-round comfort in various climates. The included installation kit and wall bracket simplify set-up, though being a ductless split system, it’s best suited for homes or rooms where ductwork isn’t practical.

Daikin adds durability features like anti-corrosion treatment and easy maintenance options, plus air purification to improve indoor air quality. The remote control and multiple fan speeds offer convenient control and comfort customization. While 39 dB is quiet, it’s not the absolute lowest noise level available on some ultra-quiet models. Additionally, the size of the outdoor unit might require some space considerations, and the initial cost and installation for a mini-split system can be higher than window units or portable ACs. This Daikin model fits well if you want a reliable, quiet, and energy-efficient air conditioner for medium to large rooms without ductwork, balancing comfort, quiet operation, and efficiency.