Best way to make an attic fan smart?

[RBoy (www.rboyapps.com - Making SmartThings Easy!)]

You can definitely use a simple sensor and then create an automate rule to turn on/off the fan based on the sensor.

Another way to control it would be to limit when it runs using a smart switch only, if you have access to RBoy Apps check out this SmartApp:

[RELEASE] Attic Fan Smart Ventiation

Introducing the Attic Fan Smart Ventilator On request from folks here is an app for the Smart Attic Fan Ventilator. [IMG_2182] [IMG_2183] Key Features It turns the attic fan ventilation on/off based on internal and external conditions including: Sunlight on the roof Outside temperature Inside temperature Target/expected temperature Supports up to 3 operating schedules Operate only in specific modes If you have any feature requests please send it in. TIPS If you don’t have a external light/temperature sensor install the Smart Weather Tile and Updater here. You can use this as your external light and temperature sensor. [RELEASE] Smart Weather Station Tile Updater and Severe Weather Notifications - Fix Broken Modes and Repeat Notifications This app is available on the RBoy Apps serv…