Hi Sleepy,
FYI, I just posted a "Type To Siri" macro that allows you to use KM to control HomeKit devices, without using on screen images. You simply run a query from a KM Macro with Text. You could use this to poll the temperature every x amount of time and do some other action based on the response you get from Siri - i.e. Query = What is the Temperature in the Living Room? Siri's Response: The Temperature is 75 degrees etc. - and you can capture the response to then use a KM If Then etc., to run other macros, based on the temp number in the response.
Good Luck