What is the recommended minimum relative humidity for good air quality in a home during the heating season?

The recommended minimum relative humidity for good air quality in a home during the heating season is 40%. Maintaining humidity levels around this percentage is crucial because it helps to ensure comfort and minimize issues associated with low humidity, such as dry skin, respiratory problems, and increased static electricity. Additionally, insufficient humidity can exacerbate the transmission of viruses and allergens in the air, negatively impacting indoor air quality.

While levels below 40% can lead to discomfort and health problems, going above this threshold, especially toward 60% or higher, can potentially contribute to conditions conducive to mold growth and other moisture-related issues. Thus, aiming for around 40% balances comfort and health considerations effectively during the colder months when heating systems can significantly lower indoor humidity levels.