Humidify your home
• In the winter, make sure the humidity in your house is between 30 and 40 percent. If your house has forced-air heating or steam radiators, the actual humidity may be far less—often, as little as 10 percent. But a plug-in humidity gauge at a home-supply or hardware store to keep tabs on the humidity. When it gets below 30 percent, turn on a humidifier.
• In summer, turn on the air conditioner only when you absolutely need it. It dehumidifies the air as well as chilling it.
• If you have a fireplace or wood-burning stove, use it sparingly. The heat that’s generated from these sources is extremely drying.