A humidifier adds essential moisture to the air in your home and office to combat dryness usually caused by having the heating on in the winter or the air conditioning on in the summer. Dry air can cause sore throat, dry skin, chapped lips, itchy eyes and bunged up noses. Having the correct humidity can keep your mucus glands working correctly and help to keep you well. The right humidifier can also be beneficial for babies to ease congestion and keep skin soft and moisturised. Wooden furniture and musical instruments also benefit from the correct humidity, as do pets and house plants.