If you set them up properly, pelts can do a pretty decent job. For about $150 I can keep my CPU anwhere from about 10C and up. I don't bother with below ambient though, not worth all the hassle of insulating. I use four 5V pelts, my electric bill went up about $4 a month when I started using them.
If I had the knowledge and time, I would probably do a phase change upgrade. Pelts are really pretty simple to work with and do not require much in the way of experience. Mostly just commone sense.
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