They're more efficient (as compared to a conventional dryer) in heating dominated climates and less efficient in cooling dominated climates. Note that heat pump dryers based on compressors offer even higher efficiency regardless of the climate. It's possible to DIY one out of a window A/C and it's even possible to use a dehumidifier as-is in a closet.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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