Homemade water cooling (bringing goldies indoors this winter

[dannypd]

I brought my goldfish in this winter and looked upon my dehumidifier and my 20 gallon + sump and realised something...

...I put the coil that "dehumidify" my house into the sump (stretching them about 1.2 cm, careful if you do this yourself, you do not want a freon leak) and now the tank water is now colder.

I normally leave the fish out all winter, but I lose too much water to evaporation (I mean, literally, 1 gallon a day!)  So chilled water is good enough.

[StylinT]

how much does this bring the tmepature down ?  an also how much power does it burn up