10 Best Quietest Air Conditioner 2026 in the United States

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.

The SereneLife 14000 BTU Ultra Quiet Portable Inverter Air Conditioner is designed for medium to large rooms up to 650 sq. ft, making it suitable for bedrooms, offices, or living spaces. It uses inverter technology and a high-efficiency rotary compressor to cool quickly—about 50% faster than typical portable ACs. While the product claims to operate at 43 dBA for quiet performance, the official noise level is around 53 dB, which is still reasonably quiet but may be noticeable in very quiet environments like bedrooms at night. Its energy efficiency is solid, being up to 40% more efficient than standard portable units, which helps save on electricity bills over time.

This model also offers multiple functions including cooling, heating, dehumidifying, and fan modes, controlled easily via a remote or smart Wi-Fi, adding convenience and versatility throughout the year. Installation is straightforward with the included universal window mount kit, and maintenance is simplified by a washable air filter. The unit is portable with smooth casters and has a modern, compact design that fits well in most rooms. However, it weighs about 53 pounds, which might be a bit heavy for frequent moving.

It comes with a 1-year warranty, and while it may be less silent than traditional split ACs or units specifically designed for ultra-quiet operation, this SereneLife portable AC represents a good choice for those needing efficient, all-season climate control with moderate noise levels and easy installation, especially if mobility and Wi-Fi control are important factors.

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.