Hotels don't use water diffusers — and the reason is simple. Diluting oil in water weakens it. Cold-air nebulisation keeps the fragrance at full strength and disperses it as a dry mist that hangs in the air evenly, so the scent is the same when you walk in at 8am as it is at 8pm. No damp patches, no mineral scale, no "it faded after an hour."

For an open-plan home — where cooking, pets and everyday life compete — that consistency is the whole point.

Being honest: if you're scenting a single small room and you actively want the extra humidity (say, a dry bedroom in winter), an ultrasonic diffuser can suit. Just expect a lighter scent, more frequent refills, and regular cleaning to avoid mould and mineral buildup.

Yes. Ascent Collection oils are IFRA-compliant and dispersed as a dry, cold mist — no heat, no water. As with any fragrance, use standard ventilation and follow the guidance for your space. 

A note on pets: animals are more sensitive to fragrance than we are, so diffuse in well-ventilated rooms, always leave a door open so pets can move away, and keep the diffuser and oils out of reach. Cats and birds are especially sensitive to airborne fragrance — if you have either, or a pet with a respiratory condition, introduce scent gradually, check with your vet, and stop if you notice any discomfort.

No. They atomise neat oil directly — nothing is added or diluted.

Because the oil isn't diluted in water. Full-strength fragrance is dispersed evenly and timer-controlled, rather than fading as water evaporates.

No — cold-air produces a dry micro-mist, so there's no dampness or mould risk.

Yes, with standard ventilation — the oils are IFRA-compliant and diffused without heat or water.

We recommend using Ascent Collection oils. They're formulated at the correct viscosity for cold-air nebulisation, so they atomise cleanly and disperse evenly. Generic, water-based or pre-diluted oils can clog the mechanism and won't perform the same way.