Since I haven’t found anything to handle ventilation using an attic fan (beyond just simple on/off) and on request from folks here is an app for the Smart Attic Fan Ventilator.
It turns the attic fan ventilation on/off based on internal and external conditions including looking at the sunlight on the roof, the temperature outside, inside and the target expected temperature.
It supports up to 3 operating schedules that can be configured.
If you have any feature requests please send it in.
TIP: 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 - Fix Broken Modes
This app is available on the RBoy apps server (along with all the rest of the premium and free apps) http://smartthings.rboyapps.com.
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The latest version of these apps with updates are available on the RBoy server.