3 Tips for Humidifier Safety

It’s the time of year for skin, dry eyes and irritated sinuses. Humidified air can offer relief but can quickly become a health hazard when not used properly.

There are a few common ways to humidify the air including central humidifiers connected to the whole house heating system, ultrasonic cool mist humidifiers, evaporated humidity via a fan and wick system and steam vaporization.

The use of at home humidification systems can offer a lot of relief in dry winter months, however, can become dangerous when not properly cared for. Following a few precautionary steps can be the difference between preventing or perpetuating respiratory conditions.

A humidity level between 40-60% has been shown to reduce the rates of respiratory infections at home, school and workplace.¹ High humidity environments prove to increase risks of respiratory illness including pneumonia. Dust mite and fungal spore counts elevate in a higher moisture environment, typically at relative humidity levels above 60%. Humidity levels lower than 40% increase symptoms of dryness but also allow bacteria and virus to easily travel through the air. Maintaining humidity levels, not exceeding 60%, requires the use of a humidifier in dry winter months. Evaporative or heated humidity mechanisms are the ideal modalities to increase the moisture content, as they are less likely to disseminate aerosolized contaminants.²

How to Keep Your Humidifier Safe

Change humidifier water often

Start by using distilled water, as regular tap water will cause mineral build up on the machine not only making it less effective but allows these contaminates to get disseminated into the air.

Clean at least weekly

Hydrogen peroxide or white vinegar are helpful to reduce bacteria development in your machine. Clean the humidifier tank and basin with your solution of choice and rinse thoroughly. If your unit has a filter change as often as recommended.

Replace old units

At some point, it will be difficult to keep deposits from forming on the unit and it will be time to think about replacing it. Mineral build up promotes bacterial growth.

Consider a humidistat to monitor humidity in your home to ensure proper air moisture as too much can become a health hazard. Monitoring levels of humidity are also important for those who suffer allergies or asthma as these conditions are exacerbated when air moisture content is high.


  1. Arundel, AV, Sterling, EM, Biggin, JH, Sterling, TD. Indirect health effects of relative humidity in indoor environments. Environ Health Perspect Environmental Health Perspectives. 1986;65:351–361. doi:10.1289/ehp.8665351.
  1. Tyndall, RL, Lehman, ES, Bowman, EK, Milton, DK, Barbaree, JM. Home Humidifiers as a Potential Source of Exposure to Microbial Pathogens, Endotoxins, and Allergens. Indoor Air. 1995;5(3):171–178. doi:10.1111/j.1600-0668.1995.t01-1-00003.x.
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