What you are really asking for is the air cooling, the "refrigerator" bits, to work at low outside temperatures.
There is no way short of fooling the whole car by bodging the outside temperature sensor to read high.
The climate control is still working fine, producing the cabin air temperature that you have set on the control panel.
As far as I know, the air cooling is turned off at low outside temperatures so as to avoid the formation of ice on the cooling matrix which would block all cabin air flow and really get you steamed up.
If your car is getting steamed up inside, I'd check for water leaks, either the door seals or the pollen filter: check under your carpets to make sure there aren't puddles of water under there.
At low outside temperatures the air cooling isn't going to make much difference to the water content of the cabin air in any case. Try turning the heat up a bit more?