What should I set my humidifier to in order to achieve the optimal humidity levels within my living space? Is there a specific percentage or range that is universally accepted for comfort and health? Considering factors such as the season, climate, and even personal preference, how do these variables influence the ideal setting? Furthermore, could the presence of certain allergens or respiratory issues necessitate adjustments to the humidity level? How might one determine if the air is too dry or too humid, and what are the signs that would indicate a need for alteration? In addition, is there a correlation between specific room sizes and the required humidity setting? Could different areas of my home have varying needs, or should a single setting be sufficient across all spaces? How do I ensure that my humidifier is functioning effectively to maintain this ideal humidity level?