The advancement of the Internet of Things (IoT) provides a set of new possibilities and challenges within the Industrial and Manufacturing environments, as well as into the Private Sector and the user daily life in our houses. In this context it is important to design and provide an IoT integrated system with a scalable architecture while maintaining a set of competitive costs and performance. This paper presents the development of low cost IoT‑based Smart Home Temperature and Humidity Monitoring System. The proposed architecture aims to demonstrate core IoT principles such as real‑time data collection, remote device control, and scalable architecture using low cost technologies, such as Arduino Uno R4 Wi‑Fi and ESP32 microcontrollers. The system successfully simulated appliance control ‑ e.g., radiators, extractor fans ‑ via LEDs and basic actuators, combined with a mobile application providing real‑time environmental data ‑ e.g., temperature, humidity, Carbon Monoxide (CO) levels ‑ and remote‑control functionality. Thanks to the proposed design the architecture is also inherently scalable, customizable and expandable, combining a modular approach with a customized mobile app and an user friendly interaction. Challenges included hardware compatibility, power management, and software integration, with further work on security features (i.e., cryptography algorithms) and cloud integration.