Abstract: A thermally isolated flush mounted room temperature sensing apparatus has a sensor assembly with sensor elements mounted on a printed circuit board and generates a value that is indicative of the sensed temperature. The apparatus has a generally sealed box structure with a wall plate attached to an open end of the box structure, and the sensor assembly extends through an opening in the wall plate. The assembly is mounted to an insulating block located in the box structure and is supported by spring retainers to have the assembly float away from the block to provide thermal isolation. Other thermal isolating features are provided.