Final answer:
Indoor relative humidity should be maintained between 30% and 50% in the winter and below 60% for the rest of the year for optimal comfort and health.
Step-by-step explanation:
Indoor relative humidity (RH) should ideally be between 30 and 50% during winter to maintain comfort and health. High levels can lead to condensation problems while too low levels can dry out airways and skin, and affect overall comfort. During the rest of the year, RH should be less than 60%. One can use a humidity gauge to check levels indoors and use humidifiers or air conditioners to regulate it. Understanding the importance of RH is necessary for both health and comfort.
The indoor relative humidity (RH) should be between 30 and 50% in the winter, and less than 60% during the rest of the year for optimal comfort.