BSEE IASI-RO DOI: 10.2478/9788395720413-019 213 METAMATERIALS FOR ”nZEB” BUILDINGS Victoria COTOROBAI 1 , Ioan Cristian COTOROBAI 1 , Silviana BRATA 2 , Ionuţ - Cristian BRANCA and Ana- Diana ANCAȘ 1 1 ”Gheorghe Asachi” Technical University from Iași 2 POLITEHNICA University, Timișoara Abstract. Metamaterials are specially designed to interact, in a controlled manner, with various waves. They are very "young" but they have attracted the attention of specialists from the construction area. The buildings have known throughout their existence different approaches in terms of functions, requirements, concepts, materials used, and other, in correlation with the level of civilization, technology, climate characteristics, primary needs, or desire to express the power/the luxury in the different moments and for different people. The concept of the nZEB building was recently promoted. The metamaterials developed so far can also be used in nZEB, such as: for controlling the impact of the different waves with the building; in the equipment of thermal/visual comfort; in the control components; for increasing the performance of power generation equipment. This paper has inventoried some metamaterials that can determine the growth of the building's energetical performances and examples of the growth potential of the thermal and visual performance of glass systems containing metamaterials (static and dynamic). Keywords: metamaterials; metamaterials for roof cooling; waves guide for PV cell; thermal & acoustic metamaterials (aerogels). 1. Introduction 1.1. Buildings of the future. Requirements. Insurance possibilities. The recent climate changes, identified from the studies/measurements/observations made at the level of the planet Earth, have highlighted the need to reduce the concentration of CO 2 in the terrestrial atmosphere, respectively the need to promote the measures of energy efficiency of buildings (reduction emission CO 2 , by reduction energy consumption from fossils resources) [1, 2, 3, 4]. Lately, the measures promoted are completely new (results of the newest research & innovation). These must enable the energy performance of buildings to be increased and in relation to other quality criteria (environmentally friendly, acoustic; ensuring & maintaining human health; be dynamic-adaptable to occupant demands and environmental changes