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I went down the road of zigbee2mqtt and xiaomi zigbee sensors. It's very simple and the zigbee sensors are very cheap.
The alternative is using an esp32 with esphome and the xiaomi Bluetooth temperature sensor. This would probably be the cheaper option but once you have zigbee2mqtt set up, it opens up a variety of other cheap sensors.
Any recommendations for external Wifi temperature sensor that is compatible with HomeAssistant?