When I used window unit, I would turn thermostat up in 70's while gone from home then lower it when I got back home. I have not found turning the AC off while away beneficial at all.
It is expensive, but I have had Ductless AC put in my home which has cut my electric bill in half. In fact, it is less expensive to run in my 2 story home than it cost to run 1 window 10,000 BTU AC unit
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