This study was conducted to control the inside environment in mushroom production maintaining the desire humidity and to reduce temperature inside the room. Theretore. this Study aimed to increase the production of mushrooms by maintaining the desire humidity of 80% to 85% and to lessen the hot temperature to produce the maximum yield in the production. Controlled environment farming was developed using a 250 W (10 head ultrasonic mist maker) fogger with a dimension of 85mm (width) x 253mm (length) x 28mm (height) and an a atomization output of 7 ke/H; recommended at an area of 10 m2. The fogger was installed to modify the environment in the culturing room of mushrooms and was triggered through DHI! temperature and humidity sensor. One sensor was placed to monitor the controlled environment and compared it to the traditional method, differentiating the effects of modification of environment in the growth of the mushrooms. Data gathering includes the temperature and relative humidity at a given time per treatment was performed daily and the weight (z), number of shoot (pcs) that was gathered during the harvesting period as well the height (cm) measured. After the observation and gathering of data from the two system, treatment T2 (controlled environment) was observe to be the best treatment for the oyster mushroom in terms of temperature and relative humidity with a range of 27-28 °C and 80°e-85% ; in weight (g) with a mean of 101.6g in first harvest , 100.9g in second harvest; and in shoot (pcs) with a mean of 10.9 (pes) in first harvest and (1.1 (pes) in second harvest; almost twice the yield from T (traditional method). The result shows that the development of automated controlled environment was proven to be efficient in growing oyster mushrooms. It was observed that the increase in relative humidity followed by the decrease of temperature helped produce a better yield than the traditional method. It resulted in the increase of weight and shoot growth; making the yield almost twice in value than those that were from the traditional method. However, the said treatment does not have a heavy impact in the height of the harvested mushrooms.