Do I need one
Can you dehydrate in an air fryer?
Yes, for small batches of fruit and herbs. The limits are capacity and the lowest temperature the machine will hold, and both matter more than the button on the panel.
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Do I need one
Can you dehydrate food in an oven? Oven vs dehydrator
For herbs and the occasional tray of fruit, an oven does the job. For anything regular it is slower, more expensive to run and cannot hold the low temperatures fruit and herbs want.