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Hello CC, this is Kelly with Dyson. I'm sorry for any misinformation that might have been given to you regarding the Dyson HP04. The machine does need to be on, in either heat or cool mode, to have the air purified. Best wishes, Kelly Dyson Customer Support
Sorry, there was a problem. Please try again later.This happen very often, tech support has less knowledge or answer to customers without check manuals. You can use Diffused mode as air purifiers.
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