Cold-air technology is the professional standard for scenting, delivering a beautiful fragrance over large spaces while preserving its full integrity, so your spaces always smell amazing. Unlike ultrasonic (water) diffusers, cold-air models produce a fine, dry mist that flows naturally, creating a wide and consistent scent experience. They use only a tiny amount of scent oil, making them highly economical. Most of our models let you adjust intensity and control settings via the Aemster app, so you can tailor and automate your scent effortlessly. With minimal maintenance, just fill once and enjoy months of continuous fragrance. This is the most powerful, precise, and hassle-free scent solution available.

When choosing the right diffuser, it’s important to consider the size of your space, ceiling height, and natural airflow. We offer units for both small and large spaces.

Shop by room size

For Small Spaces (up to 50 m²)
Ideal for single rooms or compact areas. These diffusers deliver a consistent, high-quality scent while using minimal oil. Intensity levels can be adjusted.

For Medium Spaces (up to 150 m²)
Perfect for larger rooms, apartments, or small offices. These standalone units offer customizable intensity and scheduling via Aemster app, allowing you to tailor the scent experience to your environment.

For Large Spaces (up to 1,600 m²)
Designed for businesses, large homes, or venues. These professional-grade diffusers connect to your HVAC system to scent large spaces and work with existing ventilation. Built-in intensity levels and scheduling give full control over the scent experience across wide areas.