Maintaining an optimal humidity level helps you breathe easier and sleep better. Heating in the winter tends to dry out your environment especially in already dry climates. If you wake up with dry skin and stuffy sinuses you might need a humidifier. Humidifiers make breathing easier for you and your kids when you have a cold. Clean them regularly to prevent mold spore and bacteria build up. If you have a damp cellar you may want a dehumidifier to remove moisture to prevent mold growth. Excessive humidity levels in your home are a breeding ground for fungi, mold, and mildew as well as moths, fleas, cockroaches, and dust mites.