Rainy Season Home Moisture Control Guide: Prevent Mold and Pests
Complete guide to moisture control during the rainy season (May-June plum rain season in Taiwan). Covers dehumidifier selection, clothing mold prevention, bathroom moisture control, and food preservation tips for a dry and comfortable home.
Last Updated:2026-03-13
Table of Contents
1. When is the rainy season in Taiwan? Why is moisture control essential?
The plum rain season (meiyu) in Taiwan typically runs from mid-May to mid-June. A full month of continuous rainfall pushes indoor humidity above 80%. High humidity is not only physically uncomfortable but also causes serious household problems.
| Problem | Trigger conditions | Impact |
|---|---|---|
| Mold growth | Humidity above 70% for 48+ hours | Moldy walls, mildew spots on clothing, worsened allergies |
| Dust mite proliferation | Humidity above 60% + temperature 25 degrees Celsius and above | Sneezing, itchy skin, asthma attacks |
| Wooden furniture warping | Prolonged high humidity | Wardrobe doors that will not close properly, swollen and buckled flooring |
| Appliance damage | Circuit board moisture exposure | Short circuits, reduced appliance lifespan |
| Food spoilage | High humidity + high temperature | Stale snacks, moldy dried goods |
Tip
- The ideal indoor humidity level is 50-60%. Use a hygrometer to monitor it.
- Do not wait until mold appears to take action. Prevention is always easier than mold removal.
2. How do you choose the right dehumidifier? Types compared and recommended
A dehumidifier is the most important home appliance during the rainy season. Choosing the right one makes a huge difference.
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Calculate required dehumidification capacity
Each ping (3.3 square meters) requires about 1 liter per day of dehumidification. A 10-ping room needs a unit rated at 10 liters per day or above.
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Energy efficiency
Choose units with a Level 1 energy efficiency rating. Although they cost NT$1,000-2,000 more upfront, they save more on electricity bills over time.
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Water tank capacity
Emptying the tank daily during rainy season is tedious. Choose a tank of 3 liters or larger, or a unit with continuous drainage capability.
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Noise level
For bedroom use, choose a unit rated below 40 dB so it will not disrupt your sleep.
| Type | Suitable room size | Price range (NT$) | Advantages | Disadvantages |
|---|---|---|---|---|
| Compressor type | 26-66 sq ft (8-20 ping) | $6,000-15,000 (~$190-480 USD) | Strong dehumidification, high efficiency | Heavier, louder operation |
| Desiccant wheel type | 10-26 sq ft (3-8 ping) | $3,000-8,000 (~$95-260 USD) | Effective at low temperatures, lightweight | Higher power consumption, lower capacity |
| Small dehumidifying boxes | Closets/shoe cabinets | $50-200 (~$1.60-6.50 USD) | No electricity needed, inexpensive | Limited capacity, requires regular replacement |
| Air conditioner dehumidify mode | Rooms with AC installed | No extra cost | No additional appliance needed | Not all AC units have dehumidify mode |
Tip
- Place the dehumidifier in the center of the room for best results. Do not place it against the wall.
- Clean the filter regularly (every 2 weeks) to maintain dehumidification efficiency.
3. How do you protect clothing and closets from moisture and mold?
Clothes and closets are the most vulnerable areas during the rainy season. Leather and cotton items are especially fragile.
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Place dehumidifying agents in closets
Put 1-2 moisture-absorbing bags in each compartment. Reusable silica gel dehumidifying boxes are a good option.
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Dry clothes completely before storing
Putting slightly damp clothes in the closet is the main cause of mold. Use a dryer or dehumidifier to help finish drying.
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Store leather items separately
Wrap leather bags and shoes in dust bags, stuff them with newspaper to absorb moisture, and air them out periodically.
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Bamboo charcoal for moisture absorption
Place bamboo charcoal bags in closet corners. They naturally absorb moisture and odors, and can be reused after sun-drying.
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Maintain spacing between garments
Do not pack clothes too tightly. Leave room for air circulation. Hanging is better than folding for ventilation.
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Vacuum-seal off-season clothing
Store clothes you are not currently wearing in vacuum compression bags to completely seal out moisture.
Tip
- If you find mildew spots on clothing, treat the area with white vinegar or lemon juice before washing.
- During the rainy season, dry clothes indoors using a dehumidifier combined with a fan to speed up drying.
4. How do you control moisture and prevent mold in bathrooms and kitchens?
Bathrooms and kitchens are the dampest areas in any home. The rainy season makes them even more prone to mold growth and unpleasant odors.
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Run the exhaust fan for 30 minutes after showering
Bathroom humidity can reach 95% after a shower. The exhaust fan needs to run for at least 30 minutes to effectively reduce moisture.
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Treat moldy silicone sealant
For moldy bathroom silicone, apply bleach with paper towels for 30 minutes. Severe cases require removing and reapplying the sealant.
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Prevent mold in tile grout
Spray anti-mold solution on tile grout lines, or apply anti-mold tape to prevent mold from growing.
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Keep kitchen countertops dry
Wipe the sink dry immediately after use. Replace or sun-dry dish cloths and sponges regularly.
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Dehumidify the refrigerator
Place a bowl of baking soda in the refrigerator to absorb moisture and odors. Replace it monthly.
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Ventilation is key
Open windows in bathrooms that have them. For windowless bathrooms, install a ventilation fan.
Tip
- Keep the bathroom door half-open normally for air circulation, but close it when running the dehumidifier.
- After showering, use a squeegee to remove water from walls and glass. This significantly reduces residual moisture.
5. How should you store food and dry goods during the rainy season?
High humidity and high temperature accelerate food spoilage. Dry goods and snacks easily become stale and lose their texture.
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Seal dry goods in airtight containers
After opening tea, nuts, and cookies, store them in airtight jars or zip-lock bags with the air squeezed out.
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Include food-grade desiccants
Do not throw away the desiccant packets from snack packaging. You can also purchase food-grade silica gel desiccants separately.
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Use a sealed rice container
Store rice in a sealed container with insect prevention packets. Consume it promptly after opening.
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Freeze bread for longer freshness
Toast and bread can develop mold within 2 days during the rainy season. Portion and freeze them, then toast directly when ready to eat.
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Seal spices airtight
Pepper, chili powder, and other spices will clump when exposed to moisture. Store them in sealed glass jars.
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Inspect the pantry regularly
Check once a week. Remove any stale or expired items immediately to prevent mold from spreading.
Tip
- Food-grade desiccant packets can be reused after sun-drying for 2 hours.
- Do not overfill the refrigerator. Poor air circulation inside actually leads to condensation.
6. How do you treat moldy walls? Long-term moisture prevention solutions
Moldy walls are not just unsightly. Mold spores floating in the air can trigger respiratory allergies and require thorough treatment.
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Mild mold: Wipe with rubbing alcohol
Spray 75% rubbing alcohol on the moldy area, wait 10 minutes, then wipe with a dry cloth. This kills surface mold.
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Moderate mold: Treat with bleach solution
Wipe the moldy wall with diluted bleach (1:10 ratio). Wear gloves and a mask, and ensure good ventilation.
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Severe mold: Call a professional
Large-area or recurring mold requires professional mold removal services. The wall may need to be scraped and repainted.
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Waterproof paint for prevention
Apply anti-mold waterproof paint to walls prone to mold. This fundamentally blocks moisture from penetrating.
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Keep furniture 5 cm from walls
Maintain a gap between large furniture (wardrobes, bookshelves) and walls to allow air circulation.
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Moisture barrier panels
For large wall areas, apply moisture barrier sheets or diatomaceous earth panels for long-lasting moisture absorption.
Tip
- Always wear an N95 mask when treating mold. Mold spores are harmful to the respiratory system.
- Top floors and basements are most prone to water seepage and mold. Proper waterproofing during renovation is the fundamental solution.
Important Notes
Pregnant women, infants, and people with asthma should avoid contact with mold. Have other family members handle the mold removal.
Key Takeaways
- 1 The rainy season (May-June) pushes indoor humidity above 80%. Active moisture control is essential.
- 2 Choose a compressor-type dehumidifier. Allow 1 liter per day per ping of room area. Place it in the center of the room for best results.
- 3 Dry clothes completely before storing. Place dehumidifying agents in closets. Air out leather items regularly.
- 4 Run the bathroom exhaust fan for 30 minutes after showering. Wipe kitchen surfaces dry after use.
- 5 Store food in airtight containers with desiccants. Freeze bread to extend freshness.
- 6 Treat wall mold with rubbing alcohol or bleach. For severe cases, call a professional mold removal service.
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General Disclaimer
The information provided on this site is for reference only. We do not guarantee its completeness or accuracy. Users should determine the applicability of the information on their own.