To provide favorable environment condition to the plants, greenhouse technique is used. To protect the plant from adverse climatic condition this technique seems more beneficial. Even during the winter, greenhouse stays warm inside thus helps in plant growth. The expections of sunlight highlight the importance of solar energy to agriculture. To improve continuously the productivity, profitability, sustainability of our major farming systems, we need a new and effective technology i.e. greenhouse technology. In order to optimize the productivity of plants, agriculture and horticulture seek to optimize the capture of solar energy. Specially those crops and plants which are not naturally suited to local climate , greenhouse convert solar energy to heat enabling year round production and growth of those crops. The problems of increasing atmospheric co2 concentration in atmosphere and the possible future climate changes result in low productivity, thus green house technology is considered as beneficial technique.

Being Nepal having tropical, sub tropical and temperate climate, many recent studies in Nepal are presented where greenhouse are combined with several systems to provide a favorable microclimate for crops under extreme tropical and sub tropical climates. Other applications such as greenhouse dryers and seawater green house desalination were also discussed. Greenhouse technology is becoming an increasingly indispensable and a viable solution for modern methods of crop production. Nepal being an agricultural country, thus also individual or families cannot meet their most basic need for food due to food insecurity. In remote mountain areas where the shortage of arable land and harsh climate, make it impossible to produce sufficient quantity of food throughout year.

The investigation in humla shows that using solar technology helps to improve food security. Solar greenhouse and dryers has also been used to meet the increasing food production. Depending upon the type of greenhouse, type of crop, environmental control facilities, the yield may be 10-12 times higher than that of outdoor cultivation. Extreme heat exposure can stress plant, stunt development and cause plant mortality during extreme summer , thus on the basis of utility the 2 types of greenhouse for active heating and for active cooling can be used. Based on shape, construction, covering material greenhouse technique can be used according to the purpose. Self employment for educated youth on farm can be increased after knowing the importance of greenhouse technology.