Rework _scan_thermostat() and related #6022

Job	Run time
Cache identify	6s
Shellcheck	6s
Dependency	4s
Prepare	7s
Ruff check and force	8s
Check commit	23s
Run pytest using Python 3.14	18s
Run pytest using Python 3.13	16s
Run mypy	17s
Process test coverage	12s
Build and publish Python 🐍 distributions 📦 to TestPyPI	9s
Process test complexity	11s
	2m 17s

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