I’m still learning as well but I have an alternative solution for your first question using the big timer node:
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To your second question, and I know there’s a better way to do this but a “current state” node will help. It’s basically; “is this already on? Yes - then do this. No - then do this”.
There are three of them in the flow I posted above, they should be able to show you how to use them.
I misread your second question. In your “over 80?” state node, is “Output only on state change” checked or unchecked?