Abstract: A freezer provides multiple zones of temperature for preserving a frozen product at an ultra-low temperature. At least one first housing provides a first interior space at a first predetermined temperature. A first compressor, condenser and metering device supply a first refrigerant to a first evaporator for lowering the temperature in the first interior space to the first predetermined temperature. At least one second housing is mounted totally within the first interior space and provides a second interior space for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature. A second compressor, condenser and metering device supply a second refrigerant to a second evaporator for freezing the second housing to the second predetermined temperature. The second compressor, condenser and metering device are disposed within the first interior space to the first evaporator.