Humidifiers are used to add moisture to the air, usually with the intent of combating dry climates
using it for most glues when the air is dry, this helps with retention, you need to find out what humidity your glues should work best in and get yourself a Hydromoter .
If it’s to low you will need a humidifier if high humidity dehumidifier. Aircons remove humidity but can also take to much out of a room when it’s hot then a humidifier is necessary.
The humidity in your beauty room affects how fast your lash glue binds to the clients natural lashes.