Appliances and, more broadly, energy-using products have totally changed our lives in less than a century. However, these modern marvels convey too often an image of lightness and of lack of economic and environmental costs, as their consumption of energy (e.g. electricity, fuel coal or gas) is not directly related to practices. Public policies are increasingly encouraging the production of more efficient energy-using products. The energy efficiency of appliances is seen as a step for reducing the energy consumption of households. There are good arguments for the increase of energy efficiency of products and appliances: energy independence, energy cost and climate change.