Some AC companies put a lock on the thermostat so it won’t go below 68. We bought a new home in Fenney in 2017 and that happened to us. When I called Sun Kool they told us they do that so the ax won’t freeze. I told them to come out and undo it which they did and then I heard a spiel about the warranty not being good if something happens when I set it below 68. That’s bogus. Anyway you most likely will need an ac person to come out and unlock it unless you can find how to do it on you tube. You can find everything there.
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