Why Mould Can Grow in Air-conditioned Rooms

AC units primarily regulate temperature, not humidity. In closed spaces, compressor cycling and stagnant air can trap moisture, promoting mold. Ensure adequate ventilation and consider professional storage for high-value items.

Hong Kong's climate is humid and sultry all year round. Every spring and summer during the 'Huinan' period or the rainy season, many families, in order to prevent moisture and heat, habitually keep doors and windows closed all day and keep the AC on for long periods, thinking that since the room is cool and the AC helps with dehumidification, clothing and furniture should be perfectly safe.

Who knew that after a month or two, the moment you open your bedroom wardrobe or the storage box under the bed, what greets you is a pungent, old moldy smell; look closer, and your luxury genuine leather bags bought for tens of thousands of dollars, expensive wool coats, and even precious photo albums are covered with small white-green mold spots! People often find it hard to believe: even with the AC on all day, why does a closed space still become a hotbed for mold growth?

Still smelling mold even with the AC on all day? A direct hit on the tragedy of moldy clothes and leather goods in closed spaces

Many people mistakenly believe that low temperatures in AC-cooled rooms prevent mold. In compact living spaces, large wardrobes and cabinets are often placed against walls. When the AC is on and windows are closed, these areas can form a micro-climate where moisture accumulates. Stagnant air in corners can affect stored leather, silk, and photos. If you discover damage on valuable items, consult a professional conservator or repair specialist rather than attempting DIY repairs.

Cooling doesn't equal dehumidifying? Dissecting the physical truth of rising relative humidity and condensation

AC units are designed for temperature control rather than precise humidity management. When the target temperature is reached, the compressor may reduce its operating frequency while the fan continues to run, which can alter moisture control performance. Airflow directly hitting surfaces can lead to temperature differences, potentially causing condensation that supports mold growth.

How to place desiccants without damaging leather goods?

When managing home clothing and storage daily, everyone can implement the following standardized moisture-proof measures: First, place hygrometers in wardrobes and storage spaces to monitor the microclimate at any time. When the relative humidity exceeds 60%, you must cooperate with an independent dehumidifier for targeted dehumidification; second, selecting moisture-absorbing accessories is a big deal; it is recommended to use natural silica gel desiccants in high-seal bags or Binchotan charcoal packs to absorb water vapor through physical micropores; open cabinet doors regularly and use a fan to blow towards the inside for 15-20 minutes to break the stagnant state of dead corners.

However, never place traditional calcium chloride boxed desiccants directly against genuine leather bags or high-end silk clothing. The chemically alkaline water formed after calcium chloride absorbs water is highly corrosive; once tilted and leaked, it will instantly drain the natural oils from the leather, leading to leather hardening, blackening, or even brittle cracking and perforation, causing irreversible destruction.

Home AC closed environment vs. professional storage comparison: Which temperature and humidity control best protects precious collections?

Home AC rooms and professional storage environments have essential differences in humidity control ability and mold prevention depth. To give every Hong Kong citizen a better budgeting direction when preserving high-value items, the following is a detailed comparison list of common moisture-proof storage environments to help you accurately evaluate which strategy best meets your actual needs:

Through the table above, it can be clearly seen that purely relying on home AC is difficult to overcome the defects of rising relative humidity and air stagnation. Only maintaining a constant low humidity and active convection is the robust strategy for eradicating mold growth.

Seek Professional Help

Although you have learned daily self-inspection tips like using fans to increase convection, placing silica gel desiccants, and monitoring hygrometers, it is very difficult for a general home environment to achieve all-weather precise temperature and humidity balance facing Hong Kong's half-year humid 'Huinan' period and summer rainy season. Space at home is narrow, seasonal thick quilts, down jackets, expensive leather goods, and collectibles are piling up more and more, and the tight wardrobe and under-bed space simply lack enough room for air to flow smoothly; keeping a home dehumidifier on all day not only consumes alarming electricity but also requires you to worry daily about the water tank being full and stopping the machine.

Once you go on a business trip or travel for a few days, the indoor humidity immediately rebounds, letting your beloved belongings once again be exposed to the threat of mold. Instead of worrying daily and feeling anxious and helpless about the old moldy smell throughout the house and expensive bags getting moldy, why not hand over the storage task of expensive items and seasonal belongings to our professional self-storage team?

We help you properly place every beloved collection, fully release valuable home living space, and let your items stay as dry and fresh as the first time whenever you open the box.

FAQs

Q1: Is keeping the AC's 'Dry Mode' on a substitute for a dehumidifier to prevent mold?

A1: It cannot be fully substituted. The AC's dehumidification mode works by low-speed cooling to let the heat sink condense moisture; when the room temperature reaches the lower limit, the compressor will stop, and dehumidification will immediately be interrupted. Conversely, an independent dehumidifier can continuously remove air moisture without significantly lowering the room temperature; its humidity control ability is much more stable than that of an AC.

Q2: Why do leather shoes and photos kept in a sealed plastic box still get moldy and have white spots?

A2: Because when they were put into the plastic box, the moisture and micro-mold spores in the surrounding air were simultaneously locked in the box; furthermore, temperature differences will form tiny condensation on the inner walls of the plastic box. In a closed box lacking air circulation, anaerobic mold is instead easier to accelerate reproduction.

Q3: When should I consider moving seasonal clothing, leather goods, and expensive collections to constant temp/humidity self-storage?

A3: When home storage space is insufficient leading to excessive squeezing of clothes, the residence is close to the sea or mountains and extremely damp, the inside of the wardrobe frequently emits a sour moldy smell, or you possess high-value leather jackets, luxury bags, precious calligraphy/paintings, and musical instruments that need long-term moisture-proof value preservation, moving to a professional self-storage is an extremely secure and worry-free choice.

One Plus One Storage Services

One Plus One Storage provides professional self-storage services, committed to offering citizens flexible, convenient, and reasonably priced storage solutions. We deeply understand the issues of land supply shortages in Hong Kong's urbanization process, as well as the current situation where changing work modes lead to an increasing need for home space among citizens. Therefore, we pioneered One Plus One Storage to respond to these growing demands.

Our self-storage units cover various sizes; whether customers need small storage space to house personal items or large storage space to house company documents or furniture, we can provide suitable solutions. Furthermore, our pricing is fair and transparent, and we offer flexible lease terms; whether for long-term or short-term, customers can choose flexibly according to their own needs.

Welcome to request a quote or inquiry: Click to contact us on WhatsApp

- Address: Room 16-17, 9/F, Nan Fung Commercial Centre, 19 Lam Lok Street, Kowloon Bay

- Phone: 3188 1889

- WhatsApp: 6928 9628

- Email：enquiry@opostorage.com

Feel free to contact us anytime, let us provide you with professional self-storage