How to Keep Your Home Comfortable in Summer: Temperature, Humidity & Indoor Air Quality

How to Keep Your Home Comfortable in Summer: Temperature, Humidity & Indoor Air Quality

Summer discomfort is often not caused by the house itself or by your physical condition alone. In many cases, it comes from a combination of environmental factors.

By checking the numbers and creating a gentle flow of air, your home can feel surprisingly more comfortable. Let’s start with what you can do today.

Introduction

From the rainy season into summer, many people start to feel small changes at home: a heavy feeling in the body, difficulty sleeping, or a sense that storage spaces feel stuffy.

According to Japan’s Ministry of Health, Labour and Welfare, heatstroke can occur not only outdoors, but also indoors, even when you are not doing anything active. The Ministry of the Environment also explains that heat stress is affected not only by temperature, but also by humidity, using the WBGT heat index. In addition, Japan’s Ministry of Education, Culture, Sports, Science and Technology notes that mold tends to grow more easily when high humidity continues.

In this article, we have summarized practical tips for creating a more comfortable and reassuring home environment, based on public information.

Primary Sources

Make Summer Indoors Easier by Balancing Temperature, Humidity, and Airflow

Even at the same room temperature, high humidity can make the air feel heavier. Heat-related health risks and moisture-related mold problems may seem separate, but they are actually closely connected.

A comfortable home is not only about design. It is also about the air, humidity, and how easy it is to keep the space clean. A few small adjustments can make daily life feel much better.

Checklist: How to Make Indoor Heat Easier to Manage

Purpose: To avoid pushing yourself too hard in the heat, and to manage not only temperature but also humidity, following the WBGT concept.

1. Start by making temperature and humidity visible

  • Place a thermometer and hygrometer in the room.
  • Relying only on how you feel can delay your response. Numbers make it easier to judge the situation.

2. Cool the room and move the air

  • Use an air conditioner together with a fan or circulator.
  • You may not need to lower the air conditioner setting too much if the air is moving properly.

3. Soften direct sunlight

  • Use blackout curtains, bamboo screens, or similar items during the day.
  • Reducing the heat that enters the room can also improve cooling efficiency.

4. Drink water before you feel thirsty

  • Drink small amounts of water regularly.
  • Once it becomes a habit, it can help stabilize your condition during summer.

Checklist: How to Reduce Moisture and Mold-Prone Areas

Purpose: To avoid keeping humidity high for too long, and to reduce the stuffy feeling inside the home.

5. Avoid placing large furniture completely against the wall

  • Leave a small gap behind cupboards, chests, and living room boards.
  • When air has a path to escape, the back of the furniture is less likely to feel stagnant.

6. Pay attention to low and enclosed spaces

  • Ventilate shoe cabinets, lower closet areas, and the back of storage spaces regularly.
  • The less air moves, the more moisture tends to remain.

7. Do not overfill storage spaces

  • Leave some open space inside cabinets and closets.
  • A little breathing room improves both appearance and usability.

8. Do not store wet items

  • Dry towels, rain gear, shoes, and sports equipment before putting them away.
  • Reducing the source of moisture is often the most effective step.

9. Create a weekly “open-air day”

  • Once a week, open cabinet doors and drawers to let the air move.
  • It is a simple habit that costs nothing and is easy to continue.

Places Where Stuffy Air Often Builds Up in Summer

  • Behind kitchen cabinets: steam from cooking and poor ventilation can leave moisture behind.
  • Storage along north-facing walls: less sunlight and less air movement can make moisture remain.
  • Shoe cabinets: wet shoes and outdoor humidity can easily enter.
  • Under beds and around large bedroom furniture: moisture from sleep and bedding can accumulate.

Using moisture absorbers is one option. However, in the long run, designing the home so that air can move— with gaps, openings, and easy-to-clean spaces—often makes daily life feel more comfortable.

Frequently Asked Questions

Q1. Which should I prioritize: a dehumidifier or an air conditioner?

If heat or physical discomfort comes first, an air conditioner is usually the safer priority. On the other hand, if laundry or storage humidity is the main concern, a dehumidifier can be helpful. Rather than choosing only one, it is realistic to start with cooling and air circulation, then add dehumidification when needed.

Q2. My closet or storage room smells moldy. What should I do?

Rather than simply covering the smell, it is better to reduce the cause of moisture first.

  • Take items out and ventilate the space.
  • Do not store wet items.
  • Reduce how tightly things are packed.
  • Avoid placing storage cases directly against the wall.

Q3. What should I watch out for with indoor heatstroke?

It is easy to let your guard down on days when you stay indoors. The basics are:

  • Check temperature and humidity.
  • Use air conditioning before it becomes too hot.
  • Drink water regularly.

Conclusion: A Better Summer Starts with Better Air

  • Summer comfort depends not only on temperature, but also on humidity.
  • When high humidity continues, mold can grow more easily.
  • Heatstroke can happen indoors, so it is important not to endure the heat too much.

Choosing Furniture That Helps Create a More Comfortable Summer Home

The goal is not to buy furniture only as a “moisture countermeasure.” However, when you choose furniture that is comfortable and made to last, your summer living environment can also become easier to manage.

Here are some ways to apply the ideas of temperature, humidity, and airflow to furniture selection.

1. Kitchen: Choose MOISS panels and slide shelves for steam-prone areas

Steam from rice cookers and electric kettles can trap heat and moisture inside kitchen storage. For this reason, kitchen furniture becomes easier to use when the structure and material help reduce trapped moisture.

MOISS is a porous ceramic-based building material made from natural materials such as diatomaceous earth and vermiculite. It is known for moisture absorption and release, deodorizing performance, and adsorption of harmful substances. For people concerned about steam from kitchen appliances, it can be a reassuring material.

2. Bedroom: Choose slatted beds or tatami beds if moisture is a concern

Bedrooms can easily become low, enclosed spaces where air does not move well. A structure that allows moisture to escape underneath the bed can provide more peace of mind.

3. Living room: Choose furniture that makes cleaning easier

Because family members gather in the living room, dust and dirt can easily build up. During the humid summer season, furniture that makes cleaning easier is especially useful.

4. Choose furniture with indoor air quality in mind

During hot seasons, windows are often kept closed. That is why materials and safety standards can also be important factors when choosing furniture.

5. For homes where children or grandchildren visit, rounded corners add value

Furniture with rounded corners can be a good choice for families who want a safer and more comfortable living environment.

  • Nagomi chest with rounded corners made from Japanese hinoki

    Summer discomfort and stuffy air are often caused by a combination of environmental factors. By checking temperature and humidity, and by creating a flow of air, your home can feel much more comfortable.

    Start with one small thing you can do today.

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