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One of the DLC options for it plays Ride of the Valkyries, which also feels appropriate.

Indirectly.

Home Assistant is taking a weighted average of 4 sensors (this one at only 20% of the total) and using that to play tricks on the heat pump. So it caused only around a 1.2°C difference in the value that matters.

Of course it’s a nice spring day today and I have all the doors and windows open, so that heat pump is on fan-only mode anyway.

I think I may need to do something similar.

At this time of year, sun coming through the skylight hits the temperature sensor in the dining room for an hour or so each day.