Agreed the most efficient time to run the A/C is during DFCO.
However, when you're accelerating at BSFC, you want to covert as much energy as possible into momentum.
The engine is inefficient at idle, which is why that's the best time to add some load to it (to make it works harder and therefore more efficiently). This also has the effect of spinning the compressor slower, so it's like an underdrive pulley.
Many modern cars with variable displacement compressors will turn the A/C off when accelerating and ramp it up when idling. Same thing with alternators.
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