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It is always purifying the air as it pulls room air through it's HEPA filter. The only reason I see to not do this would be to extend the life of the filter. It does track air quality so it might be surprising to actually see what the air quality is as it does change throughout the course of a day, week, etc.
Sorry, there was a problem. Please try again later.Hi there, this is Krystal with Dyson. The Dyson Pure Hot + Cool is always purifying the air whether you have it on fan or heat. There is not an option on this model to disable the purification feature and just have a fan/heater. Best Wishes, Krystal Dyson Customer Support
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