Aloha Phil, welcome to the community
This blueprint is just a basic timer.
I am developing a blueprint for ceiling fans though, 
Temperature Control Fan. It currently works of temperature but time, device tracker, maybe presence would be some condition I would consider adding to it. Looks like you live in Hawaii and it would be a good place to get some feedback from you and your thoughts on my other blueprint.
I am thinking rise in temp + time condition + HA knows your home = fan ON. Maybe have a look at the other blueprint and if you like post something in that thread.
Blacky 