Hi @k8gg,
I ran a primitive experiment with an Aeotec sensor along side 2 Unity boards (with/without a case).
I attempted to show extreme variations in temperature by placing the sensors in cold water (in a bag), and then in front of a fan heater.
The different rates at which the sensors change is caused by the devices having different/no enclosures.
The Unity board on its own is 40mmx20mm. With the case it is 45mmx25mm.
Hope this helps!