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Yes the fan can stay on all the time with the heat only turning on when the room drops below the selected temperature. The heat does not make a noticeable noise when it comes on. It does not have a rechargeable battery.
Sorry, there was a problem. Please try again later.Hi there, this is Kelly with Dyson. You can use fan mode at all times. In heat mode, you're able to set a target temperature. Once your room reaches that temperature, the machine will stay on, so it's still purifying the air, but you won't feel heated air coming from the loop. There is no noise to indicate when the heat is active. This machine is also a plug-in unit, it does not feature a battery, for use if the power should go out. Best wishes, Kelly Dyson Customer Support
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