Disable relay when used purely as sensor

I have a number of smart thermostats that I use purely as temperature sensing devices for larger rooms, or those with poor TRV placement. They link back to an extension kit. This works well, but I note that the relay is still powered in these modules even though they are not wired. The resulting click and power consumption is thus unnecessary and could likely be avoided, creating less nighttime distraction and enhancing battery life.
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