If the air is too dry in your home, Action Air Plumbing and Septic recommends AprilAire air humidifiers. A humidifier adds water vapor to the air to prevent dryness. Moister air can help you avoid the respiratory irritation and inflammation that are so common in winter. The irritation can trigger allergies and worsen allergy symptoms. Inflammation can make you more prone to the common cold, flu, and other illnesses.