Report on the holistic impacts on renovation integrated solutions

The Happen project is aimed at stimulating the market uptake of deep retrofitting of buildings, with special regard to the Mediterranean area and to the residential built stock, by tackling major bottlenecks. In the Project framework, the definition of different suitable retrofitting options for each reference building into a specific climate and "integrated sets of renovation measures" plays a pivotal role and is developed in the Work Package 3 entitled "Optimal Solutions". The present deliverable D3.5 belongs to this WP3, in particular refers to the Task 3.4, whose title is "Calculation of the holistic impact of the renovation interventions". In the present deliverable the aim is to demonstrate the holistic impact of HAPPEN, evaluating the spillover effects both for stakeholders of retrofitting and for society more in general, starting from data of the POSs fine-tuned in Task 3.3 for different countries and climate zones. In a complementary manner to T3.3, the present aim is the economic evaluation of the retrofit investment, not only from a financial point of view, but also from the environmental and social one, first through the comparison of the different solutions of retrofitting also from this point of view in order to define, for each Package of Optimal Solutions (POS) identified in the previous deliverables, the environmental and economic sustainable better solution, using combining results from Life Cycle Costing (i.e., LCC) and non-parametric technique (i.e. DDF methodology). Moreover, the positive externalities due to reduction of energy consumption and less CO2 emissions will be evaluate, also economically, thanks to the data of a survey carried out among the project partners. For each country, a single analysis will be carried out (with the construction of country files) while, for those whose where data resulted to be available, a cross-sectional analyses will be performed, to compare how the various countries behaved in terms of energy efficiency during the three periods considered. For some countries, using data and results of the DDF methodology and of the survey between the countries, a comparison will be made between before (current state of the stock of building emerging from the survey and related Primary Energy Consumption and CO2 emissions) and after deep retrofitting, in terms of possible environmental improvements and also economic savings. The main idea is to estimate costs recovery referred to CO2 and Primary Energy Consumption if the buildings of the pilot cases studies presented in deliverable D3.4 adopted the optimal solutions selected through the holistic efficiency score developed in the present deliverable. Measures on the energy efficiency of buildings, and consequently actions aimed at promoting retrofitting interventions, are very important because more and more studies are showing that, unlike what was previously thought, i.e. thermal systems for heating buildings have an impact on total CO2 emissions in urban areas, which is up to 6 times higher than the incidence of vehicular traffic.