Check comfort index every day. The indoor environment, temperature, and humidity are also related to a comfortable and healthy lifestyle. Maintaining just the right room temperature, moderate humidity, and a comfortable space not only gives comfort, but also eliminates waste of energy, such as overheating and overcooling, and prevents the active generation of ticks and mold. It is said that it has a preventive effect against influenza virus. The temperature at which people feel comfortable may vary slightly, but from this perspective, the humidity is said to be 50% or 40-60%. For those who are weak, sick, newborn babies, people with allergies, etc., you want to watch them at just the right temperature and humidity. If you have a thermo-hygrometer that knows both temperature and humidity, you can check it at any time, and you can immediately respond to minor changes.