Originally from https://community.smartthings.com/t/control-thermostat-fan-based-on-temperature-difference/49460/5

Install Instructions

1. Fork this repo
2. Change "er0ckx" folder to your Smartthings IDE username
3. Change "er0ckx" namespace value in groovy file to your Smartthings IDE username
4. Commit and push to your forked repo
5. Log into Smarthings IDE, https://graph.api.smartthings.com/
6. Click on "My SmartApps" tab
7. Setup Github integration TODO
8. Add this repo to settings TODO
9. Click on "Update from Repo" button
10. Check "smartapps/temperature-difference-fan-control.src/temperature-difference-fan-control.groovy"
11. Check "Publish"
12. Click on "Execute Update" button