Imagine what would happen if everyone knew as much about insulation as they do about energy saving bulbs. The light bulbs in our homes have changed drastically in the past ten years. The walls, however are the same. Enrico and I decided to take a look at exactly how much energy we can expect to save on a night like M'illumino di meno or Earth Hour. And then, just for fun (!), we decided to compare that saved energy with how much we'd save by adding one single square meter of insulation to the external wall of our outdated apartment building. Here are our results...