09-23-2019, 08:57 AM
You can add an ordinary electric meter to your guest room circuit, maybe just the line going to the A/C. This is a low tech solution, and won’t allow you to control anything, but it will tell you whether your guests are leaving the A/C on when they go out. The meter displays a blinking red light if there is power consumption, and the heavier the power consumption. the more frequently it will blink. At which point you can either go in there and turn it off, or remind them to do so.