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better_thermostat
This custom component for Home Assistant will add crucial features to your climate-controlling TRV (Thermostatic Radiator Valves) to save you the work of creating automations to make it smart. It combines a room-temperature sensor, window/door sensors, weather forecasts, or an ambient temperature probe to decide when it should call for heat and automatically calibrate your TRVs to fix the imprecise measurements taken in the radiator's vicinity.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I simplified my original explanation a little. I actually use an add-on ( Better Thermostat ) combined with a separate temp and humidity sensor. It’s not necessarily relevant to your question about controlling the home thermostat (nest) but worth knowing about if you go down the rabbit hole.