If what you want is a good thermal and acoustic insulation for your home, do not hesitate for a moment, choose to change the windows with good profiling. At Cristaleria Formas, in Madrid centre, we offer you PVC windows or Aluminium windows with thermal bridge break that together with a good glazing fulfil this function of thermal and acoustic insulation and other features that will give comfort to your home. But if you also want to gain light with less profiling, choose Aluminium windows with thermal bridge break with hidden sash conserving the same qualities of thermal and acoustic insulation.