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Reducing the energy consumption in buildings is one of the most important challenges of modern architectural design in the era of climate changes. Designing the energy effi cient architecture requires a number of different factors to be taken into account in the energy balance of the building. These include both the reduction of energy used for heating purposes in winter and the reduction of energy used for cooling purposes in summer. The issue of overheating of the buildings in summer is one of the common problems of low-energy architecture, that gives great opportunities for the use of greenery. The potential impact of greenery on the reduction of energy demand can be considered in several aspects. One of the most important is the infl uence of greenery on amount of solar radiation reaching the building interior through the glazed parts of façades – this is called passive solar heat gain. Restricting the access of the sunlight to the façades can help to reduce the energy usage for the cooling purposes in summer. It can be achieved using various kinds of greenery, located on the ground in the building plot – like deciduous trees or conifers, or directly on the façade – like vertical gardens or creepers. On the other hand, shading the façade by the greenery may lead to energy losses due to reduced passive solar heat gains in winter. The aim of the research is to assess the potential of using greenery to reduce the energy consumption of the building in Polish climate conditions and to fi nd the most profi table balance between potential solar energy gains and losses caused by greenery.

Potential of using greenery to reduce overheating of buildings in Polish climate conditions