Hi everyone.

There is something I don't understand on the technical catalogue of a brand of air coolers - DX.
For R22, the lowest the evaporating temperature (T0) the highest the correction factor (CF).

Example:

R22

T0 = -5 ºC, CF = 1,0
T0 = -25 ºC, CF = 1,02
T0 = -40 ºC, CF = 1,04

Can someone please help me on this?
Thank you very much in advanced.