I only turn the aircon off when it’s really really cold. My current car has an electric heater, it warms the car up very quickly. Which is great right now it’s getting very cold in the morning and i deffo notice it over my old golf.
Both my current car and the last 2, all had a windscreen de-mist button that auto turns on the aircon, if it’s rainy and damp then i just hit that for a bit and it clears up quick, but it is noisy as hell as it turns it on full blast..
The rest of the time the aircons is on all the time as it keeps the car cooler and on a hot day (when we actually get them) aircon is bliss.
I don’t really care if it uses slightly more fuel, comforts more important, but i cannot say on a long 140 mile journey to london i have noticed any real difference in fuel cost driving using acc at the same speed everytime, traffic permitting of course.