Without reading every post to see how many times its been suggested already, look into Homeassistant and ESPHome, I built a purely local thermostat using a relay, ESP8266 & DHT11 temp / humidity sensor and then it's easy to add more sensors as you go.
Home assistant can run on a PI and is purely local but supports almost every smart home manufacturer.
Without reading every post to see how many times its been suggested already, look into Homeassistant and ESPHome, I built a purely local thermostat using a relay, ESP8266 & DHT11 temp / humidity sensor and then it's easy to add more sensors as you go.
Home assistant can run on a PI and is purely local but supports almost every smart home manufacturer.
Good luck diving down the rabbit hole buddy.