The AC compressor is quite efficient, I've run it when I lived in FL, when I picked the car up in Dallas and drove back, it causes very little parasitic loss. It was not uncommon for me to see 105+ temps on the roads around Tampa/Orlando and the AC not skip a beat and stay cold, however those higher air temps just heat soak the entire car and I felt that total heat soak is what just makes any car feel sluggish, not necessarily the drag of running a compressor.
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