The idea of passive building technology has brought a great revolution at the construction and renovation of hotel buildings in Corfu. The reason is simple and economical. Specifically, what would be the most cost-effective building if one account not only the construction cost but cost management? From this idea was the model of passive buildings. Environmental factor was minor, but it is obvious that if a passive building consumes almost 90% less energy than the corresponding conventional then the environment is big winner.