Fix leaks immmediately. Clean and dry wet or damp spots immediately. Remove mold-contaminated materials. Regularly inspect and maintain heating, ventilating, and HVAC systems. Routinely inspect and clean HVAC drip pans, check power flow and that drain is unobstructed. Maintain low indoor humidity, ideally 30-60%. Vent moisture-generating equipment to the outside, where possible. Increase surface temperature by reducing the humidity to prevent condensation that results when surface temperature is below dew point temperature. Keep gutters and downspouts in working order and ensuring that they drain water away from the foundation. Remove wet, absorbent structural items and cloth furnishings if they cannot be easily and thoroughly cleaned and dried within 48 hours. Replace with new materials as soon as the underlying structure is thoroughly dry.