One thing about the lack of air: (and I know some idiot that called me out on FI will hate this) if you dont hear a rush or air or dont look out and see the air connected to your plane when it's a hot day don't shut off the air. We always default to single engine taxi but will never burn more than is necessary...
If the company can't figure out that air is needed to cool the cabin....then run it! Not much thought process goes into that. DTW and SEA never hooked up air today on a very warm day. I can never forgive laziness...