Originally Posted by Talgrath
Well, assuming you freeze the ice in your already existent freezer, there's no increase in energy use. As far as waterprint, using ice probably uses less water than a wort chiller unless your tap/hose water is very cold.
Although, of course, putting room temp liquid in your freezer will increase the energy used by the freezer.
Once the wort is down to only 10 or so degrees above the chiller water temp, it takes forever to get it down much more. One thing I often do to get down to those last few degrees of cooling with full-boil recipes is place ice in a sanitized plastic bag and put the bag in the wort.