ELI5: How do refrigerators and AC units work if you can't generate cold the same way you generate heat? explainlikeimfive

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Submitted December 29, 2014 at 08:26PM by PM_ME_PRETTY_EYES http://www.reddit.com/r/explainlikeimfive/comments/2qppvt/eli5_how_do_refrigerators_and_ac_units_work_if/ explainlikeimfive