GRUTEC FIBRE is a Swiss based producer of organic fibers for thermo-dynamic applications. These fibers are used for direct storing of sun energy, drying or moisturing as well as heating and cooling of air. The conception of latent energy storage ensures long term conserving of caloric energy without loss through convection or radiation and without requiring insulations. GRUTEC FIBRES achieve the highest performance regarding capacity of latent heat storing and heat pump efficiency. The physical conception of this technique consists of adsorption and de-sorption of moisture on the pores within the GRUTEC FIBRES.