Ah ok, i think i understand now. Thanks varooom!
So if i've got this right, if i had AUTO enabled but A/C switched off then it's possible the temperature might never get cool enough on a hot day because AUTO can only control air vents/fan speed but wouldn't actively cool the air, is that right?
And if i've got this right, then although having A/C enabled on a cold day doesn't stop the air being routed via heating elements, it's still useful because of the dehumidifying effect of the A/C unit?
I guess then there's an argument that it makes sense being able to switch off A/C on cooler days as you're basically wasting energy cooling air only for it to be heated before the vent and unless misting up is an issue that seems wasteful.
I think it all makes sense to me now - thanks!