I currently have a 5.45 x 3.25 meter walk-in freezer running on a Copeland 4HP Discus Compressor with room temp set at -20 Centigrade. I was wondering if I could add another condensing unit and evaporator to reach -35 or -40C so I can convert the storage freezer into a blast freezer during the times that I need to do so. Is this a practical solution to both financial and space constraints? The panels are 4 in. polyurethane.