Syntax of transforming temperature items

[rossko57]

@rqxrqx

there is no direct method like .toNumber for a number:temperture item

That’s right. The state of a Number:Temperature Item will be something like 10°C, it is a quantity and the units are part of the state. 10°C is the same as 50°F is the same as 283K. If you get “just the number”, should you expect 10 or 50 or 283?
There are ways to work with quantities without guessing or hoping -

Working with Number:Temperature Items in rules

openHAB provides Quantity Type features, which can seem baffling. On top of that, Temperature type Quantities have a few quirks all of their own. These notes intend to guide the rules author. I’ve shown work examples in DSL rules language, see below for other scripts examples. All have similar features, if different syntax. Knowing what can be done is half the battle. What is a Quantity Type? Simply, Item states and rule variables may contain Quantities - that just means a number AND a unit …