The big compartment can reach the set point temperature while the smaller compartment never reaches the desired set point temperature. However, the smaller compartment has a very good stable temperature.
Both compartments were set for -20C for around 4h and than the bigger one was set to 4C and the smaller was set to -12C.
Notice that the smaller compartment, when set to -20c only reached around -12.9C even after 4 hours running straigth. Then, when set to -12C, it allowed the temperature raise to -5.5C.
