Hi, I’m Yu. Growing up in a typical Japanese household, energy saving wasn’t just a financial choice; it was a fundamental part of our upbringing. In Japan, we call this Setsuden (saving electricity). This practice is deeply rooted in the Mottainai spirit—the idea that it is wasteful to use more than what is truly necessary.
Today, I want to share with you the practical methods I’ve refined over 40 years to keep a home comfortable while significantly reducing energy footprints. By blending traditional seasonal wisdom with modern efficiency, you can create a home that respects both your wallet and the environment.
1. The Philosophy of Zonal Living
One of the biggest differences between Japanese and Western homes is how we view heating and cooling. In many countries, central heating warms every corner of the house. In Japan, we focus on ‘zonal’ comfort. We heat or cool the room we are currently using, rather than the entire building.
I recommend keeping internal doors closed to trap the desired temperature in your immediate living space. This simple habit is a cornerstone of the secret to a stress-free Japanese home, as it reduces the strain on your appliances and creates a cozy, controlled environment.
The ‘Kotatsu’ Mindset
Even if you don’t own a traditional heated table (Kotatsu), you can apply the principle: heat the person, not the air. During winter, I use heavy lap blankets and localized heaters. By focusing warmth directly on the body, you can keep the thermostat significantly lower without feeling the chill.
2. Seasonal Shielding: Sudare and Insulation
In Japan, we live in close rhythm with the seasons. This means our homes must adapt physically as the months change.
- Summer (Sudare): We use bamboo screens called Sudare on the outside of windows. These block 80% of solar heat while allowing breezes to pass through. If you can’t use bamboo, reflective window films or heavy blackout curtains are modern alternatives that mimic this effect.
- Winter (The Bubble Wrap Hack): A common DIY trick in Japan is applying bubble wrap to window panes. The pockets of air act as an extra layer of insulation, preventing heat from escaping through the glass. It is inexpensive, easy to apply with just a spray of water, and incredibly effective.
3. Appliance Mindfulness and ‘Standby’ Awareness
We are very conscious of ‘vampire power’—the energy appliances consume even when turned off. In my home, I use power strips with individual switches. When I am done with the toaster or the rice cooker, I flip the switch to completely sever the connection.
Furthermore, we optimize the timing of our chores. For instance, I’ve learned that simplifying laundry day involves using the ‘eco-mode’ on the washing machine and taking advantage of natural sunlight for drying whenever possible, rather than relying on a high-energy tumble dryer.
The most effective ‘Setsuden’ hack is the 2-degree adjustment. In the summer, set your air conditioner to 28°C (82°F) and use a circulator fan to move the air. In the winter, aim for 20°C (68°F) and wear a light hanten (padded coat) or sweater. These small adjustments can reduce your energy bill by up to 15-20% without a noticeable loss in comfort.
4. Harnessing Humidity
In Japan, we understand that perceived temperature is heavily influenced by humidity. In the summer, we use dehumidifiers to make 28°C feel like 24°C. In the winter, we use humidifiers (or simply hang laundry indoors to dry) because moist air holds heat better than dry air. Managing your home’s humidity allows you to use your HVAC system much less frequently.
Conclusion
Energy saving in the Japanese method isn’t about deprivation; it’s about mindfulness and efficiency. By adopting zonal heating, seasonal window treatments, and appliance awareness, you align your home with the natural world. Start with one small change today—perhaps unplugging an unused appliance—and feel the satisfaction of the Setsuden spirit in your own home.
