Firebase Realtime Database schema for IoT climate control systems organizes four core collections: users (profiles and device associations), sensorData (temperature, humidity, timestamps), deviceStatus (heater, fan, humidifier states), and controlSettings (target values and alert thresholds). Each collection branches from the root node with unique identifiers (userID, readingID) enabling real-time synchronization across connected devices. This schema demonstrates best practices for structuring IoT data in Firebase, separating user management from sensor telemetry and device control for scalable climate automation. Fork this diagram on Diagrams.so to customize collections, add authentication rules, or extend the schema for multi-zone HVAC systems. Perfect for prototyping smart home dashboards or industrial environmental monitoring applications.