You can also get a heat pump outdoor unit (one that's easy to hack), connect it to a few feet of copper tubing, pull a vacuum and run the unit in *heating* mode. If it's not obvious why that would work, the heating mode of a heat pump is just an air conditioner in reverse, so that the outdoor unit is the evaporator.
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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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