During summer citrus season, I air dry outside, bringing in the peels overnight to avoid dampness.
http://thewoksoflife.com/2017/05/make-dried-tangerine-peel/
This time of year, maybe heat your oven, then turn it off and place the peels inside. If you have a gas oven, I think you could probably leave the peels on a rack and they will dry in a few days without the oven even being turned on.
