10 Best Quietest Air Conditioner 2026 in the United States

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.

The Midea 12,000 BTU Smart Inverter Air Conditioner is a strong choice if you want a quiet and energy-efficient unit for a medium to large room up to 550 square feet. It offers a good cooling capacity suitable for most bedrooms or living rooms, combined with a heat feature for cooler seasons, although the heating won’t work below 41°F. Its noise level is impressively low at about 45 decibels, meaning it runs quietly enough not to disrupt conversations, TV watching, or work calls, which is great for bedrooms or home offices. The inverter technology helps save energy by adjusting the compressor speed, and the unit is Energy Star certified, promising up to 35% less electricity use than standard models.

You can control it easily via remote, an app, or voice assistants like Alexa, providing convenience and modern smart home integration. It also has multiple fan speeds and modes to customize comfort, plus a dehumidifier function that helps improve indoor air quality during humid weather. Installation is designed for standard double-hung windows, and everything needed is included in the package. On the downside, the noise spec shows 58 dB in some descriptions, which is a bit louder than the lowest claim, so expect some sound on higher fan settings. Also, while the heat function is useful, it isn’t reliable in very cold weather.

The unit’s size means it requires a suitable window opening and may not fit all window types. This Midea air conditioner suits anyone wanting a quiet, efficient, easy-to-use window unit that cools well and adds some heating, ideal for year-round comfort in medium to large rooms.