I’ve never approached it based on the outdoor temperature. I set the thermostat for whatever indoor temp I want to maintain.
There’s no rule that will work for everyone, because all houses are different. Some have more insulation and double pane windows. If you have a less weatherproof house, you’ll never make it to the highest temperature of the day, because the indoor temp will be several degrees higher. 90 degrees outdoors could equal over 100 degrees indoors.
When I was still working, we’d set it to 83 degrees while we were away from home, and then lower it when we returned. If we had left it turned off altogether, it would have been impossible to cool it down when we returned.
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