Answer (1 of 4): Essential oils will damage any rubber parts and may damage your humidifier in other ways as well as spread solvents through the air and you should not be breathing them if you are a cat or an infant or someone with compromised breathing.
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Can You Put Essential Oils in a Humidifier? - Get Green Be Well
Can You Put Essential Oils in a Humidifier? - Get Green Be Well
Why does my humidifier smell like urine? I thought scrubbing it and then letting it sit in vinegar for a few days to dissolve the calcium and kill bacteria would be enough
Is it okay to use disinfectant liquid mix with essential oil to our diffuser to clean the air of the room? - Quora
What happens if a humidifier runs out of water while you're sleeping? Could it catch on fire or overheat? - Quora
Can you put eucalyptus oil in a humidifier? - Quora
What are the benefits of adding eucalyptus oil to a room's humidifier for those with allergies and/or asthma? - Quora
Can You Put Essential Oils in a Humidifier? - Get Green Be Well
Can I put essential oils in my humidifier water? Will it damage my humidifier or is it ok? - Quora
Can a humidifier be on too long? - Quora