We apply an analytical expression to the plants and enclosed air in a greenhouse for
various design parameters and a given climatic condition. A numerical method has been used to validate an analytical expression for the plant temperature. Our analysis is based on energy-balance
equations for different components of the greenhouse. Numerical computations have been carried out for a typical summer day in Delhi. The effects of parameters such as the rate and duration of ventilation, movable insulation, etc. have been studied. Our model may be used to standardize a greenhouse for any climatic conditions.