Anybody's guess what your climate control was up to, the cars computers will know, but I think you are making the mistake of trying to pin down one reason for the stop start not activating. I know that one of my previous cars had about 15 parameters that had to be met for the stop start to activate. The heated rear window was one thing which would deactivate it. There is a post up thread somewhere about the multitude of things that deactivate it. These days the car knows more about its operating procedures than the owner, let it do its own thing. You will know when it is broken, the wheels will not go round. :-)