Nah - that unit measures the temperature. Might be in a drafty area. Gets power from a small transformer which is probably also in your basement. Might be next to another small transformer that goes to your doorbell.
There’s no doorbell. It would be totally in character with everything else in the house if it was installed in a “handyman” fashion that does technically work just not as well as if it was put in by anyone who knew what they were doing. The unit isn’t really in a draft or the airflow of a vent or the sunlight, the only temperature fluctuation is from the heating itself, and it consistently varies by time of day in a way that doesn’t really make sense if it was trying to (over)compensate for itself at any given point
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