Most of the newer (plastic) dehumidifiers are run by either a 4000 or 6000 btu compressor and use R22. The older (metal) dehumidifiers use R12 (ancient) or R134a (old) and have the size compressors in them you are looking for. I have seen a few with mini-fridge style compresssors in them that only draw 150 watts (including the fan). They run much more silently than the newer units. Check freecycle or craigslist in your area.
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