Note it is advisable to leave the AC always on
If you have climate control its unlikely the air con will be used until the outside air is warn enough to need it. Mine only switches on if I set the heater to minimum.
Some cars will use aircon when you set the demist option. The incoming air is chilled to dry it before its heated to clear the screen. Some will use it in reverse to heat the car when the engine is cold. But I think these days that's quite a rare feature.