4 Best Quiet Air Conditioners

This EUHOMY portable air conditioner is a solid choice if you need a quiet, energy-efficient unit for small rooms up to about 215 sq.ft (20㎡). It offers a decent 9000 BTU cooling capacity, suitable for bedrooms or small offices but not large spaces. Noise-wise, it runs at a low 49 dB, making it quiet enough to keep running without disturbing your sleep or work. The energy efficiency is good with a 3-star rating and an eco-friendly R290 refrigerant, helping to reduce electricity bills and environmental impact. Its 4-in-1 design means it not only cools but also dehumidifies and offers fan and sleep modes, which adds flexibility for year-round use. You get 2 fan speeds to adjust airflow, which is basic but sufficient for most needs.

Installation is straightforward since it comes with a window kit that fits various window types and the unit has wheels and handles for easy movement between rooms. The digital display and remote control make it user-friendly, and safety features like a child lock add peace of mind. On the downside, it is a bit heavy at over 22 kg, so moving it might require some effort despite the casters. Also, the 3-star energy rating is moderate—there are more efficient models if energy savings are your top priority. The cooling capacity might be limiting if you have a larger room or want faster cooling in very hot climates.

This portable AC is well-suited for users needing quiet, versatile cooling in smaller spaces with easy installation and decent energy efficiency, but it’s not ideal for larger areas or those wanting premium energy savings.

The DREO 7500 BTU Portable Air Conditioner is designed to cool small spaces up to about 20 square metres, making it a good option for bedrooms or offices. It offers a decent cooling capacity for its size, with adjustable temperatures between 16℃ and 30℃, and includes fan and dry modes for added flexibility. One of its standout features is the patented noise isolation system, which keeps operational noise at around 46 dB at the user level, quieter than many portable units, so it won’t disturb sleep or concentration. However, its sound power is listed as 61 dB, which means it is not the quietest AC on the market but still relatively low for portable units.

The unit uses an efficient 800-watt power draw with an Energy Efficiency Rating of A, helping keep running costs reasonable. It also includes a smart drainage-free system that automatically evaporates moisture, a useful feature that avoids the hassle of manual water removal in humid environments. The AC supports multiple fan speeds and smart controls, including voice commands and app control, which adds convenience for everyday use.

Installation is straightforward with a universal window kit that fits various window types, and the unit is portable thanks to caster wheels, so you can move it easily from room to room. On the downside, the unit weighs 22.5 kg and its size is relatively bulky, so it might be a bit heavy or large for some users. Also, while it has several control options, setting up smart features might require some tech comfort. This DREO portable AC suits those looking for a quiet, versatile cooling solution for small rooms with reasonable energy use and easy drainage, though its noise level and size might not be ideal if you need ultra-quiet or very compact devices.

The LEENON 14000 BTU portable air conditioner is a solid choice for cooling rooms up to around 35 square metres, making it suitable for most living rooms, kitchens, or offices in the UK. Its cooling power is strong enough to quickly bring down temperatures, thanks to advanced compressor technology. The unit offers multiple functions—cooling, dehumidifying, fan, and sleep mode—which adds flexibility depending on your needs. With three fan speeds and an auto-swing feature, it helps spread cool air evenly.

In terms of noise, it operates at about 65 dB, which is moderate but might be noticeable in very quiet rooms, especially during high-speed fan use. Sleep mode reduces noise for a more peaceful night, though it's not among the quietest available. The energy efficiency rating is class A with a SEER of 2.6; this means it is reasonably efficient but not top-tier, so electricity costs should be considered if you plan heavy usage.

Its portable design includes smooth-rolling casters and an easy installation kit that fits most windows without drilling, making it convenient to move between rooms or set up without hassle. The unit uses eco-friendly R290 refrigerant and features smart auto-evaporation to minimise manual drainage, which is a plus for maintenance. One downside is that it is relatively heavy at 28 kg, so while portable, it might require some effort to move. It also lacks inverter technology, which could limit energy savings and quieter operation found in more advanced models. This product is a versatile and powerful portable air conditioner best suited for users who want quick cooling and added features like dehumidifying but can accept moderate noise levels and average energy efficiency.