The Agency for Natural Resources and Energy of Japan suggests cleaning the filter of your air conditioning unit once every two weeks. Such regular cleaning will save you ¥860 annually, according to the agency.

As air flows, it can escape from small holes near windows or mix with air coming in from the outside. Therefore, if you place your heater far from the window, the hot air from the heater will get colder as it circulates near the window, the agency says. To counter this, place the heater in front of the window and minimize heat loss.

As you may know, hot air rises. So the wind direction of the air conditioner should be aimed downward for you to feel more warmth. In addition, you can turn on a fan and point it upward to mix the air in your room.

According to the agency, humans feel warmer as the humidity rises even if the temperature hasn't changed.

Warmth escapes through the window, so closing the curtains can help prevent heat loss.

If anything is blocking the outdoor unit of your air conditioner, the efficiency of heating the inside of your home decreases.

When it turns to winter, you don’t need your refrigerator to cool things with the same power as in summer. So, you can adjust temperature setting. Only changing the setting from high to medium-power can save you about ¥1,670 annually, the agency says.

If your toilet has a heated seat, don’t forget closing the toilet seat cover. Just shutting the cover properly can save you about ¥940 annually, according to the agency. Keeping the lid cover closed can also prevent heat loss.

It’s a given fact that putting on more clothes while staying in your room can save more energy for heat.

Finally, having hot drinks and eating foods that will warm your body are also effective. Combine all of the tips above and you'll be able to survive this winter comfortably at the lowest possible cost.