A Little Shade Makes A Green Difference

A new study finds that awnings over windows in residential buildings can reduce energy use.

A new study, “Awnings in Residential Buildings: The Impact on Energy Use and Peak Demand,” conducted by the Center for Sustainable Building Research at the University of Minnesota, has found that awnings over windows on residences can save energy costs and reduce energy use throughout the year by reducing the effects of unwanted passive solar heating.

The study was funded by the Professional Awning Manufacturers Association (PAMA), and was conducted to determine whether awnings are viable means to reduce energy use and reduce air conditioner usage in residential buildings and homes. The study investigated the energy savings for single-family homes in terms of heat gain, energy costs in heating and cooling and the reduction of energy use during peak periods.

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The results illustrate that in predominantly cold climates and mixed climates the highest energy savings are achieved when awnings are used in the summer and retracted or removed in the winter. Hot climates benefit from awnings year round, but because they are typically used year round, there is less overall energy savings when compared to the cold and mixed climates. Removing awnings during the winter helps to increase sunlight-related heat gain by allowing more light into the home.

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