Casa Ecologica: Warmer at low cost in winter, colder at no cost in summer

In 2001 two twin residential buildings wereerected in Milan, each hosting around 50 apartmentson 6 floors. They both have adopted ecofriendlyand energy efficiency solutions, butthere are also some differences among them.This paper presents the main findings of a comparisonbetween the energy performances of thetwo buildings during winter and summer seasons,showing that although the look is absolutelysimilar and the differences in the designare limited, they have an impact that cannot beneglected.