Talco's technology is unique, as two extruded aluminum sections are joined by the presence of insulators between them, which act as a thermal barrier to prevent cold or heat transfer between them. Their outdoor use of buildings, especially high-rise buildings, is useful in reducing energy costs. In European countries and countries with harsh climates exterior windows and doors with thermal insulation must be used. Two types of finishes can also be used for the inner and outer parts of these heat-insulating sections.