Today, indoor gardening provides a stable food supply in end consumers, restaurants, and retailers. Extreme heat affects stress to the plants that can lead to exhaustion. Research says that plants are said to be on optimal condition if the temperature only ranges between 15-34 degrees Celsius. Anything higher than the said temperature will cause plants to suffer, deteriorate, and also affect the plants' productivity. The researchers successfully developed an automatic mist machine that is capable of cooling a surrounding area that can control the rise of temperature in protecting and maintaining the optimal temperature required for indoor plants in a garden with a Rule-Based method. The results of the two trials were all the same when it comes to temperature and humidity over time. The rise of temperature was the decrease in humidity and vice versa, making it inversely proportional to each other. However, it resulted that the higher the height of placement of the prototype, the longer it takes to cool down the surrounding area. The study shows that the testing of functionality and validation of the system resulted in a 100% success rate. The study verifies and proves that the system is effective and efficient in the issue of the temperature control system.