Remember that a fan does not cool the environment. It cools you due to pushing the hot air away from you, but it does not actually cool the air itself. I have a dumb window air conditioning unit in my room that I've connected to a smart plug and I'm using the forecast temperature from the weather provider to automate it turning on. Eventually, I think I'll actually get a temperature sensor and switch the automation from the online forecast to the sensor instead. But the online forecast is cheaper, so that's how I've at least started out.