When the temperature drops, so does the humidity. Indoor heat—whether by forced air, space heater or radiator—further dries the air, leading to dry skin, sore throats, sinus problems, nose bleeds and annoying static electricity.
A good way to replace the lost humidity is with a humidifier. The two general types of humidifiers are those that passively allow water to evaporate, and those that actively create a blown mist (using blades, brushes or vibrations).
The main drawback to humidifiers is that if they are not kept clean, they can spread bacteria. Plan to clean them regularly—as often as every other week.