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Mildew can grow in damp bedding and ruin it, so it's important to thoroughly dry your comforter. Set the dryer on its lowest heat setting and remove the comforter periodically to make sure it doesn't burn. Use the rubber dryer-ball during drying as well to break up the down inside the comforter.
Correspondingly, can you dry a down comforter in the dryer?
Dry the comforter in an XL capacity dryer on low. This may take a few hours but will ensure that all the down is completely dry to prevent mold growth. You might want to add a few tennis balls to the dryer to help fluff the down as it dries. The goal is to prevent the down from clumping and mushing together.
Also question is, what temperature do you dry a down comforter?
Run the dryer on air fluff or the lowest temperature possible. Stop the dryer periodically and break up any lumps that are forming in the comforter or pillow. Also ensure that the down is not getting too warm as extreme heat can scorch the down. Expect the drying process to take three to four hours.
You can use balls of aluminum foil in a pinch. For extra drying power, throw a dry, clean bath towel into the dryer, as well. After 15-20 minutes, remove the towel but don't take the tennis balls out. The towel will absorb a lot of the moisture in the dryer, making the comforter dry faster.