It was only a few decades ago that people have started to really understand how important it is for us all and for the future of the planet to save energyand control our overall energy consumption. All the sudden awareness on this topic is many times a direct result of the intensive campaigns that environment organizations have put together. Apart from organizing workshops and conferences, these organizations published a large series of brochures and manuals that have turned out to be really helpful for the household users. As a general rule, people have understood the importance of understanding and putting into practice the information they find in these manuals and many times they use them to guide themselves when it comes to purchasing a new appliance or to upgrade their heating system. What the environmental institutions are trying to constantly underline is the fact that every small decision, such as a simple replacement of the light bulb, does in one way or another affec...