Perform routine based on temperature in the Classic app?

The classic app is much more powerful, but also less intuitive. So you can definitely do it, it can just take a little research to figure out how.

The following might be of help (the topic title is a clickable link). This includes discussion of Webcore. :sunglasses:

There is also a “virtual thermostat” smartapp in the marketplace of the classic app that might do what you need. ( don’t be scared off by the name, everything in the “marketplace” is free as of this writing. ) it just depends on the details, which is true of pretty much everything in the classic app.