Could a guy run copper tubeing coils, the more the better (?) , inside a freezer chilling the tubeing, then circulateing water in a closed loop system with a seperate external reservoir ( insulated), and have the chilled water run through a radiator or radiators connected within the loop with a fan to blow cold air from the radiators transfering the heat back to the reservoir? This is a question for airconditioning a closed room rather than air exchange by conventional air conditioners.