The ideal humidity level for a house is generally between 30% and 60% relative humidity , with a more specific comfortable range often cited as 40% to 50%. Keeping humidity within this range promotes comfort and health while preventing problems like mold growth and structural damage. Humidity should be adjusted according to the outdoor temperature:

• For warmer outdoor temperatures (above 50°F), indoor humidity should not exceed 50%.
• For colder outdoor temperatures, indoor humidity levels should be progressively lower (e.g., no more than 30% when it’s between 0 to 10°F outside).

Maintaining humidity between 40% and 60% can prevent mold, mildew, and dust mites while also avoiding dry skin, respiratory discomfort, and damage to wood furniture and floors. Seasonal adjustments:

• Summer indoor humidity: around 40%-60%
• Winter indoor humidity: around 30%-50%, lower in very cold conditions

Using humidifiers or dehumidifiers as needed can help regulate home humidity within these ideal ranges for both comfort and structural integrity of the house.