Rule not working anymore

Use 0.8. There are massive issues with 0.9 which makes it almost unusable.

It is a separate program. Unzip it to its own folder. See:

http://docs.openhab.org/installation/designer.html

See:

and

At a high level, put your Items in Groups, use similarly named Item names, and then loop through the Group of Temp sensor Items, pull out its associated time_since Item from the time_since Group and postUpdate the minutes.

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