Within the Energy Performance of Buildings Directive information symmetry regarding financial and environmental benefits, coming from real estate performance, is a key element in the promotion of efficient buildings. However, the link between energy efficiency and its perceived co-benefits is far from perfect in EU countries with a short trajectory in the promotion of such residential attributes, endangering the efficacy of information-symmetry policies. Using a large survey applied to sellers, buyers, lessors and tenants this paper explores, in Spain, the perceived co-benefits in terms of energy savings and thermal comfort of efficient homes and whether such perception correlates to current living conditions, housing tenure and sociodemographic profile of respondents. Results suggest that in general such co-benefits are present in the mind of the main agents of the housing market. However, their perception is far from being homogeneous, it is clearer in the case of households whose current home is poorly insulated or inadequately serviced in terms of thermal active systems. Sociodemographic conditions also play a role in co-benefits perceptions: Elder, wealthier and landlords, irrespective of whether they act as sellers, buyers or lessors, do perceive to a larger extent the co-benefits of efficient homes. Such findings signal clear paths for the improvement of energy and housing policy.

Over the last few years, new materials have been developed which a priori, appear to improve passive energy efficiency in buildings. This article focuses on chromogenic devices that allow changing their optical properties in a reversible manner through some external stimulus. The covering of the envelopes may have different textures or colors, which determine the amount of solar radiation absorbed by the material compared to the incident radiation. In buildings with a high percentage of roof relative to façade, the surface finish plays an interesting role in the energy demand. In the present work, the influence of the application of thermochromic materials to the roofs of commercial buildings is analyzed. It has been demonstrated that the application of a thermochromic surface finish can produce savings of annual energy demand between 1% and 12% in kilowatt-hours and kilograms of CO₂ and they become more significant for construction solutions with higher transmittances values. Then, the impact of applying a thermochromic finish per day is analyzed and which transition temperature range will be the most optimal to the highest energy performance is discussed. At the same time, an assessment is made of the optimal cost; although economic investment is not currently amortized, it is a good resource for reducing energy demand in buildings.

A pesar de las incontestables ventajas de la rehabilitación energética la tasa de renovación residencial es preocupantemente baja, en tanto las barreras para los hogares son infranqueables. Posiblemente se ha sobrevalorado la capacidad de éstos para emprender un proceso muy complejo que requiere conocimientos técnicos, financieros y de gestión. Así, recientemente han aparecido en la escena internacional One-Stop-Shops (OSS) para asistir de forma integral a la rehabilitación residencial. Este artículo estudia, mediante un análisis documental y entrevistas en profundidad, el panorama de las cuatro experiencias pioneras españolas. Los resultados destacan el importante papel que juegan las administraciones y los proyectos europeos como fuente de financiación y, sobre todo, de conocimiento específico; así como los obstáculos que se han superado para implementarlas y los de resolución pendiente. Estas iniciativas se vislumbran como instrumentos indispensables delante del arribo de los fondos Next Generation European Union (EU).

The LES Project (LES-Llavor Energètica i Salut. Del cole a casa i a la societat, in English: Energy and Health Seed. From school to home and society) is seen as an opportunity to increase the visibility of the role of science and women scientists in their actual contexts and to present architectural research as essential in mitigating climate change and improving people’s health. The goal of this research was to reach the greatest range of people possible through intergenerational transfer. However, the main receptors and drivers were students aged between 8 and 10 years old who were responsible for transmitting energy and environmental conditioning concepts and their interrelations with strategic performance in buildings. Awareness was raised through scientific workshops implemented in primary schools that had energy and air quality deficiencies and opportunities, and the concepts were extrapolated to housing. Two schools in different socioeconomic districts (vulnerable and middle-income families) were selected as a strategy to provide details about the perceptions of energy benefits in both schools’ families. The results of the experience were highly satisfactory. Children from 8 to 10 years old were interested and ready to understand and transfer key concepts about energy efficiency and health improvement through the transformation of the buildings surrounding them. The dissemination of the project and social awareness reached the primary students of the two schools selected for the project and the entire educational community (students, teachers, families and all of society). Currently, we are working on a second stage that will allow for a broad volume of replicability of the workshops, with schoolteachers taking the lead in these actions. For this purpose, LES has the support of the Department of Education of the Generalitat de Catalunya.