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Hi there, this is Kelly with Dyson. The HP07 is a newer model than the HP04. HP04 is a Pure Hot + Cool, which works as a purifying fan and heater. As the HP07 is a newer unit, it's been re-engineered to deliver 50% cleaner air. It also features a new combi filter, which was made from 25% recyclable materials. Performance, how the machine purifies the air, and the temperature and air flow speed settings are the same on both machines. Best wishes, Kelly Dyson Customer Support
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