DIY Water Chiller : 17 Steps (with Pictures) - Instructables
BioMONSTAAAR's Heating and Cooling System : 7 Steps - Instructables
Tip: homemade aquarium cooling - two pc fans ziptied together running from 12v power supply attached by old clip from my navigation stand (7C lower temp) : r/Aquariums
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Amazon.com: Thermoelectric Cooler Refrigeration Water Chiller DIY Water Cooling System Cooler Device Aquarium Tank Accessories for Axolotl Fish Tank 120W/180W for 30L/40L Tank (120W for 30L Tank) : Pet Supplies
Peltier based aquarium cooler/heater? - General Electronics - Arduino Forum