I won't run the a/c unless my wife and child are in the car, and then only on the highway unless it's 90F or hotter and humid.
My car takes a bigger hit with a/c than with a window and sunroof open unless it's going 70 mph+
I would never run it in my home if I lived alone - my basement never gets over 80F, so I'd just hang out there in the summer. We're fixing it up so my family can do that hopefully by next year.
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