I use a 3hp chiller for my pond 11 ton pond for last one year. Electric bill is 200+ more per mth if I keep temp around 25c. Now I keep it at around 26c so bill should be cheaper. Lower temp definitely koi have better appetite but other health problems can arise if filter not big enough to handle load.
Overall I m happy with my chiller. I use to hit 34c in my pond without shade. Now I have both chiller and shade.
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