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Your Health. A humidifier will improve your Indoor Air Quality (IAQ), help to relieve dry, itchy skin, allergies and respiratory problems as well as improve hair and complexion. Quite simply, you’ll breathe easier, sleep better and feel healthier. The American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) as well as the American Environmental Protection Agency (EPA) both recommend an indoor humidity setting of between 30-50% for optimum indoor air quality (IAQ) levels.