When should I use a cool-mist humidifier versus a warm-mist humidifier for a child with a cold?
Answer From Jay L. Hoecker, M.D.
For their safety, always use cool-mist humidifiers for children. Hot water or steam from a warm-mist humidifier or steam vaporizer can burn a child if he or she gets too close. In the event of a spill, hot water might also burn.
Humidifiers add moisture to the air. Cool-mist humidifiers may help ease coughing and congestion due to a cold. But more research is needed. Some research has found that heated humidifiers haven't helped cold symptoms.
Warm-mist and cool-mist humidifiers are equally effective in humidifying the air. By the time the water vapor reaches your child's lower airways, it's the same temperature regardless of whether it started out warm or cool.
If you use a humidifier, be sure to keep it clean to prevent mineral buildup and the growth of bacteria and molds. Humidifiers that hold standing water, particularly cool-mist humidifiers, can disperse these materials into the air. Warm-mist humidifiers generally disperse less, if any, of these materials into the air.
Emptying the tank and drying all surfaces of the humidifier daily is one way to safely keep it clean. Also, consider refilling the tank with bottled water that is labeled "distilled" or "purified," both of which contain lower mineral content than most tap water.
March 08, 2019
See more Expert Answers
- Tobin MJ, et al. Humidification. In: Principles and Practice of Mechanical Ventilation. 3rd ed. New York, N.Y.: The McGraw-Hill Companies; 2013. http://www.accessmedicine.com. Accessed Feb. 2, 2016.
- Pappas DE, et al. The common cold in children: Management and prevention. https://www.uptodate.com/contents/search. Accessed Feb. 25, 2019.
- Use and care of home humidifiers. U.S. Environmental Protection Agency. http://www.epa.gov/indoor-air-quality-iaq. Accessed Feb. 2, 2016.
- Sexton DJ, et al. The common cold in adults: Treatment and prevention. https://www.uptodate.com/contents/search. Accessed Feb. 25, 2019.
- Singh M, et al. Heated, humidified air for the common cold. Cochrane Database of Systematic Reviews. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD001728.pub6/full. Accessed Feb. 25, 2019.