10 Best Quietest Air Conditioner 2025 in the United States

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.

The LG 18,000 BTU Window Air Conditioner is a solid pick if you need to cool or heat a medium to large room, up to about 1,000 square feet. It combines cooling and heating functions, which is handy for year-round comfort. It offers two fan speeds, allowing a bit of control over airflow, though it lacks more speed settings some other models might have. The unit uses a window installation, which is common and generally straightforward but requires a special 230/208V plug for power.

In terms of noise, it runs at about 61.7 decibels, which is moderate—noticeable but not overly loud; it may not be the quietest option if you’re very sensitive to sound in bedrooms or study areas. Energy efficiency is average with a SEER rating of 2.8, so it won't drastically lower your utility bills compared to more efficient inverter models. On the plus side, it has useful features like a remote control, digital panel, 24-hour timer, and auto restart after power outages, making it convenient to use.

The washable filter and air deflection options add to user comfort and maintenance ease. If you want an all-in-one heater and cooler for a reasonably large space and don’t mind a bit of noise or moderate energy use, this LG unit is a reliable choice. However, if quiet operation or higher energy savings are your top priorities, you might want to explore quieter inverter models.

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.