The two devices look similar and often share a design, but they do different jobs. Here is how to choose.
What a humidifier does
A humidifier adds moisture to dry indoor air. It is useful in air-conditioned rooms and dry seasons, where the air can feel dry.
What an aroma diffuser does
An aroma diffuser spreads a fine mist of water mixed with essential oil, to give a room a light scent. Its main purpose is fragrance and atmosphere rather than moisture.
Many products do both
Ultrasonic models create a cool mist and often support essential oils, so one device can play both roles. Check the product details for what it supports.
How to choose
- Bedroom: a quiet, low-light device suits bedtime routines.
- Desk: a compact size and an attractive design matter more than tank size.
- Living room: look for a larger tank and a steady mist.
Care tips
- Use clean water and empty the tank when you are not using it
- Clean the tank regularly following the maker's instructions
- Keep it on a stable surface away from electronics and wood furniture
- Use only essential oils that the maker says are suitable
Browse our aromatherapy and humidifier collection to find a design that suits your space.