Medium temp condensing units are meant for walk-in coolers and freezer boxes, glass door display walk-ins, and supermarket display cases.

Low temp condensing units are for walk-in freezer boxes. Their temperature range is 0F-25F. You should buy a condensing unit with a timer for an electric defrost evaporator blower/unit coolers (LED models).

Extended low temp condensing units are for applications where temperatures of -25F-0F are needed. These are for walk-in freezers and glass door display merchandisers. They are needed to store ice cream and frozen foods.