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This project is a smart temperature and humidity monitoring system using an Arduino Nano, DHT22 sensor, and SIM900A GSM module, designed to automatically control a heater and fan through solid-state relays (SSR) based on real-time environmental data. The system displays current readings on a 16x2 I2C LCD and allows remote access via SMS commands, making it ideal for applications such as greenhouses, incubators, or temperature-sensitive storage rooms. With simple components, reliable GSM connectivity, and an efficient control mechanism, this project offers a practical and low-cost solution for remote climate control without relying on Wi-Fi networks.