You have an answer to question 1. So for question 2, the only thing I can find in native Smart Apps would require you to set up different modes. So if you had a Mode from 6-8, then a different Mode, it should work.
This would be under Marketplace - Smart Apps - Climate Control - Virtual Thermostat.
So if you don’t mind creating custom modes, then this will do fine.
If you don’t want custom modes if they will interfere with other things, then you might want to look at something a little more complex but a lot more customizable like CoRe.
But maybe somone else knows an App that might trigger an outlet based on Time and temp sensor??