Wall-mounted air conditioner and window-side environment in a residential unit (AI illustration)
AC TIPS & ADVICE

South return wet spell | AC dehumidifying is not as effective in humid weather

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What is the south return wet spell?

“Return of the south” refers to the weather phenomenon in South China each spring when temperatures gradually rise and humidity increases. This region has a typical maritime subtropical monsoon climate. Between 3 and 4 each year, warm and moist air from the South China Sea meets cold air from the north of mainland China to form a stationary front, causing changeable weather, high humidity, and occasional drizzle or fog in South China.

The damp weather during the south return wet spell can cause seepage on walls or floors in some buildings, and clothes, leather and wooden items are also prone to mould. You may think the AC will make the room drier, but when you switch it on, there may be a musty smell.

South return wet spell | Can AC replace a dehumidifier?

1. In terms of installation location and flexibility, an air conditioner generally needs to be installed in a fixed position, which greatly reduces dehumidifying performance; in contrast, a dehumidifier usually has wheels and can be moved flexibly to different areas of the room for dehumidifying.

2. The dehumidifying capacity of an air conditioner is generally only about 2 of a dehumidifier's, so insufficient dehumidification is common and the dehumidifying speed is relatively slow. In addition, using an air conditioner for dehumidifying in low temperatures does not produce a noticeable effect.

An air conditioner usually consumes more power, while a dedicated dehumidifier is better suited for long hours of dehumidification.

An AC is mainly used to regulate indoor temperature. Using it for excessive dehumidification or in inappropriate situations may increase the load on the AC system.

Find professional help

In humid weather, the dehumidifying performance of an air conditioner may not meet expectations. Engaging a professional team to clean and maintain the unit can remove built-up dirt and moisture and improve dehumidifying efficiency. This not only improves indoor comfort, but also extends the service life of the equipment and creates a better living environment for you.

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