To dehydrate apples, there are different methods and temperatures that can be used. Here are some steps and temperature guidelines from various sources:

• Penn State Extension:

  • Cut apples into ⅛ to ½-inch slices.
  • Place pre-treated slices on dryer trays in a single layer so that edges do not touch or overlap.
  • Set initial temperature to 145°F when there is surface moisture on the fruit.
  • After one hour, reduce temperature to 135 to 140°F to finish drying the slices.
  • Allow 6 to 12 hours for apple slices to dry.
  • Test for dryness. Apples are dry when they are pliable and no beads of moisture form when pressed between your fingers.

• Fresh Off The Grid:

  • Dehydrate at 135ºF (52ºC) for 6-12 hours until the apples are dry.
  • Depending on your machine, you may need to rotate the trays every so often to ensure even drying.

• Reddit:

  • One user puts the dehydrator at 155°F for around 5 hours, making sure there is no more moisture when they touch the apples.
  • Another user soaks the apples in pineapple juice, then dehydrates them until they feel leathery.

• A Couple Cooks:

  • Preheat the oven to 225°F.
  • Wash the apples, then slice them very thin, about 1/8”.
  • Place on a baking sheet and dust with cinnamon.
  • Bake for 1 ½ to 2 hours, until curled and lightly browned.

• Real Simple:

  • Bring the dehydrator down to 135°F and let it do its job! This no-supervision appliance will take about 12 hours to complete the process.

• Practical Self Reliance:

  • If using a dehydrator, set the temperature to 135 to 140°F.
  • Arrange the apple slices on trays and dehydrate for 8 to 12 hours (adjusting for humidity).
  • The apples will be flexible when finished, but completely dry to the touch.

In summary, the temperature to dehydrate apples can range from 135°F to 155°F, depending on the method used. The drying time can also vary from 6 to 12 hours, depending on the thickness of the slices and the humidity in the room. Its important to test for dryness by checking that the apples are pliable and no beads of moisture form when pressed between your fingers.