10 Best Quiet Air Conditioners 2025 in the United States

The Daikin 18,000 BTU Entra R32 Series mini split heat pump stands out for its excellent energy efficiency and strong cooling and heating capacity, making it a great choice for spaces up to 1,000 square feet. With a high SEER2 rating of 18 and an EER of 10.5, it promises lower energy bills compared to many standard units. Noise-wise, it operates quietly at 37 dB, which is comfortable for bedrooms, living rooms, or offices where you want minimal distraction.

It offers multiple fan modes including Dry, Fan, Auto, and Powerful Operation, plus features like ECO+ for extra energy savings and a sleep mode for nighttime comfort. A programmable timer and remote control add convenience, allowing you to set schedules and adjust settings easily. Installation is also simplified with the included Maxwell kit and mounting bracket.

While 37 dB is quiet, there are quieter models available if absolute silence is a priority. Also, the system's 230V requirement means it might need specific electrical setup. This Daikin mini split is well suited for homeowners or renovators looking for an efficient, quiet, and versatile air conditioner with heating capability, particularly in homes where ductwork isn’t practical.

The Midea 12,000 BTU Smart Inverter Air Conditioner is designed for medium to large rooms up to 550 square feet, offering strong cooling power combined with useful heating and dehumidifying features for year-round comfort. It stands out with its energy efficiency, holding an Energy Star rating and using inverter technology that can save up to 35% on electricity compared to standard models. The unit includes multiple fan speeds and five operating modes (cool, heat, dry, fan, auto), which allow you to tailor its performance to your needs.

A programmable 24-hour timer and remote control, along with smart home compatibility (via app and voice assistants like Alexa and Google), add convenience and flexibility. Noise-wise, it operates quietly enough to not disturb daily activities or sleep, with a noise level around 45 dB in low settings, although the specs mention 58 dB which is still reasonable for a window unit. One limitation is that the heat function won't work in very cold outdoor temperatures below 41°F, so it’s more suited for mild heating needs. Installation fits double-hung windows with specific size requirements, which is common for this product type. Its washable filter and electronic controls make maintenance and use straightforward.

This air conditioner is a strong option for those seeking a quiet, energy-efficient unit that also offers heating and smart control features, particularly suitable for moderate climates.

The Daikin 18,000 BTU 2-Zone Mini Split is a solid choice if you're looking for a quiet and energy-efficient air conditioner that can cool and heat two separate spaces independently. With a very low noise level of just 24 decibels, it operates quietly enough to be unobtrusive in bedrooms, living rooms, or offices. It has a good cooling capacity of 18,000 BTU (or 1.5 tons), making it suitable for areas up to around 800 square feet, and the included heat pump provides reliable heating down to 5°F, so it works well year-round. The system is energy-efficient with a high SEER rating of 21 SEER2 and an EER of 12, helping to keep your electricity bills in check.

The unit comes with remote controls for each indoor fan coil, plus smartphone app and voice control options, which gives you convenient ways to adjust settings like fan speed, temperature, and timer. The programmable timer and multiple fan speeds offer good flexibility to customize airflow and comfort. Its R-32 refrigerant is more environmentally friendly, which is a nice bonus. Installation includes all necessary kits and brackets, but because it's a mini split system, professional installation is recommended.

This model is not Energy Star rated, which might matter if you prioritize certified energy savings. Also, while noise is very low, the product's physical dimensions listed seem minimal, which might be a data entry error but worth confirming. It carries a premium price tag, partly due to its advanced features and 12-year warranty. The Daikin mini split is ideal if you want efficient, quiet, and customizable cooling and heating for two rooms without ductwork, but it may be more than needed for very small spaces or those on a tight budget.