Greenhouses rely on a controlled environment for optimum yield and quality of plants. Sensors help in monitoring the greenhouse environment. They help growers know when and how to adjust the irrigation/ventilation and heating systems to utilize resources better and improve the harvest. NTC thermistors work best in greenhouse conditions to help measure the temperature and relative humidity because of their fast and high responsive quality to changes in the environment. Other sensors also measure changes in environmental conditions. They can be integrated within the existing systems used for greenhouse management. The sensors can also be used to develop automated systems which can adjust the greenhouse environment on the basis of the obtained data. By using sophisticated sensors, a greenhouse cultivator can be sure that the environment is always optimum for the plants. This causes the overall profit and yield to be maximized.