The choice of the implementation of one type of measure or another will depend mainly on the energy policy of the company, on the one hand the technical feasibility of the same is assessed, which in turn depends on the configuration of the building, the urban ordinances, the use of the building, the availability of space…; and, logically, of economic viability, with its study of the potential energy savings, complemented by an economic valuation with market data, and a study of the period of simple return on investment.