I get where you are headed, but you should probably think about the ice as "fuel." The cost (in terms of heat/energy) of freezing the ice can be spent during t

I get where you are headed, but you should probably think about the ice as "fuel." The cost (in terms of heat/energy) of freezing the ice can be spent during times when you are not in the room and/or not using the "air conditioner." Actually there are commercial HVAC systems that use ice as a coolant - the water is frozen at night when electricity demands are lower and then is used to cool the building during the day.