Buildings account for over 40% of energy consumption in the European Union, and also the United States, even more than either transport or industry. If insulation in buildings is poor for example, then more energy is required to keep rooms warm, and increasing energy usage and costs for households and businesses, as well as carbon dioxide (CO2) emissions. By making buildings as energy efficient as possible we reduce energy consumption drastically, along with CO2 emissions, and this will help to make a big difference.