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Which Type of AC System Operates More Quietly?

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Choosing the right AC system is crucial for those sensitive to noise. Whether for a home office, a bedroom, or a living room, the volume of an AC unit’s operation can significantly impact comfort. While all AC systems produce some noise level, the type of system you choose and its quality play a significant role in how quietly it operates. Let’s explore the quietest options available on the market.


Understanding AC Noise Levels

AC noise levels are measured in decibels (dB). The lower the decibel rating, the quieter the unit. For reference, 30 dB is equivalent to a whisper, 40 dB is similar to the ambiance of a quiet library, and 50–60 dB matches the sound of typical conversation or background noise in a home. Most modern AC units are designed to operate below 60 dB, but some systems are inherently quieter than others.


Types of AC Systems and Their Noise Levels

Ductless Mini-Split Systems

Ductless mini-split systems are renowned for their quiet operation. The compressor, often the noisiest part, is installed outside the home, while the indoor air handler operates at noise levels as low as 19–30 dB. These systems are ideal for bedrooms, nurseries, and home offices where silence is essential. Brands like Mitsubishi, Daikin, and LG offer some of the quietest models on the market.

Central Air Conditioning Systems

Central AC systems can be relatively quiet if you invest in high-quality models. Variable-speed compressors run at lower speeds most of the time, which reduces noise significantly. Advanced systems also include insulated compressors and noise-dampening materials. While central ACs are generally noisier than mini-splits, premium units from brands like Trane and Carrier offer quiet operation at around 55 dB.

Window AC Units

Window AC units are typically noisier due to their all-in-one design. The compressor and fan are housed together, which increases noise levels, especially for older or less efficient models. Most operate between 50–70 dB, but quieter Energy Star-rated units with a decibel rating under 50 dB are available, such as those from LG or Friedrich.

Portable AC Units

Portable AC units are among the noisiest options due to their compact, self-contained design. They often operate between 60–70 dB, making them comparable to a loud conversation or a dishwasher. These units are best used in rooms where noise isn’t a primary concern.

Geothermal Heat Pumps

Geothermal systems are not only energy-efficient but also impressively quiet. Outdoor noise is almost nonexistent because there is no above-ground outdoor compressor, and indoor noise levels are generally quieter than central air systems, operating around 40–50 dB. However, these systems require a substantial initial investment and are more suitable for new builds or major renovations.


Factors That Influence Noise Levels

Beyond the type of AC system, several factors can influence noise levels. Proper installation is essential, as incorrect setup can lead to vibrations and higher noise levels. Regular maintenance, including cleaning filters and checking for worn-out components or blocked airflow, helps keep noise at a minimum. 

The location of the outdoor unit also matters; placing the compressor away from windows and high-traffic areas reduces perceived noise. Adding soundproofing measures, such as acoustic panels or barriers, can further dampen noise from outdoor units.


Stay Cool, Stay Quiet

For the quietest AC system, ductless mini-splits stand out as the top choice, followed closely by premium central AC systems and geothermal heat pumps. Window and portable units, while more affordable, tend to be noisier and may not suit noise-sensitive environments.

When shopping for an AC system, check the manufacturer’s decibel ratings and prioritize models with noise-dampening features. A little research and investment upfront can ensure you enjoy a cool, quiet, and comfortable space for years to come.

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JP Reyes

JP has been in the aircon industry for almost as long as he has been alive. As a child JP would help his tatay fix aircon units at their junk shop in Cavite. After graduating UP in the early 2000's, JP then started his own Aircon servicing business and within 5 years had 10 shops in 8 different cities. Fast forward to today and JP brings all his experience and expertise online to give readers trustworthy advice and reviews about Air-conditioning buying, servicing, cleaning and repair in the Philippines.

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