The lines of improvement at the environmental level of selection of more respectful materials with the environment. They are based on the detection of more sustainable solutions or improvements in product design that allow minimizing waste or improving its efficiency. Around efficiency, revolutionary products and strategies appear, such as high thermal conductivity threads that surround tubes made of phase change materials or PMC. The result is that indoor air quality can be based on outdoor ventilation or indoor air purification. The challenge is to consume less and less energy to do it.