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raspberry-pi-iot-garage-sensor
Discontinued A simple sensor config to detect when a garage door is opened
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Sounds like a fun and interesting project! The most obvious thing to me is a hub and spoke configuration with the individual sensors tied to a central hub which gathers all the temp data. The sensors would be mqtt-attached (similar to this). The hub would have a backend attachment to a solid IoT infrastructure like Amazon Web Services (AWS) IoT Core service (here are a couple examples of my own here and here). Once you have gathered the data onto AWS, you can also post-process the data to do trending and analysis (as well as temperature alerts, of course).
Next, setup your own LoRaWAN Server on the Raspberry PI using ChirpStack: https://www.chirpstack.io/
Finally, Install NodeRED on the Raspi (https://nodered.org/) where you can subscribe to the MQTT messages, monitor your temperature and send emails (or whatever) whenever the Temperature reaches a certain value.