Here at AIRCARE HQ, we manufacture three different types of humidifiers: evaporative, steam, and ultrasonic humidifiers. One of our most frequently asked questions is can I put essential oils in your humidifiers. The answer, yes and no. While essential oils can be used with humidifiers, you need to know which humidifiers can use essential oils and how to add the oils to the humidifier. Let us give you a quick run-through!