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A greenhouse is a facility that is set up or condition to give favorable environmental conditions and protection to crops, for the purpose of curbing activities of pests, diseases and unfavorable weather conditions. The idea of a controlled environment is one of the many farm management innovations for better agricultural practices and output, weather, climate change, pest and diseases have been limiting agricultural productivity, thereby increasing the chances and occurrences of food insecurity. Farmers that want to enter into greenhouse on commercial basis must do a better due diligence to ensure that effective and efficient cost benefit analysis. Ventilation is one of the most important components in a successful greenhouse. If there is no ventilation, greenhouses and their growing plants can become prone to problems. The main purpose of ventilation is to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent the build-up of plant pathogens that prefer still air conditions.The topographical factors like the shape of the land for example hilly, steep, rocky, flat of the site affect where a growing greenhouse structure is built. The ground beneath the greenhouse needs to be flat and not moving. Placement of growing structure on flat ground is effective because it allows easy adjustment of various mechanical controls in the greenhouse, which makes it cost-effective. The site needs to be well drained. The water supply is one of the things farmers overlook in setting up of a greenhouse farm. A good and sufficient supply of water is very crucial to the production of greenhouse crops. There are a lot of things that need to be taken into consideration as greenhouse farmer such as, the amount of sunlight, the amount of natural ventilation, the size of the farm, heating requirements, cost, condensation run-off and efficient of materials.

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