Texas freeze - sanity check

I have heat lamps on both porch and patio protecting "sensitive vegetation" during rare Texas freezes. Need some sanity check on the following rule please.

Every time the temp changes and it is below 0.5C I want the lamps to cycle through 15 min on / 5 min off. The rule seems to be more complex to me than it has to be, though I kinda have a hunch it will work. The active boolean is basically a latch that prevents multiple cycle triggers thus messing up the schedule. Thoughts?

There are other ways to do it, but this looks like it should do what you want .

You could setup some virtual devices, clone the rule using the virtual devices and make the time periods shorter and and run through it a few times to make sure.

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