The thermal mass inherent in concrete reduces the heating and cooling peaks and loads. Insulation systems are available that enable the construction of integral sandwich walls or lightweight interior insulation. The national Energy Policy Act of 1992 mandates improved energy performance in commercial buildings, and recognizes the effect thermal mass contributes to reducing heating and cooling loads. The exterior can be left unpainted with no damage from the elements. If painting is desired, it need be repainted only every five to ten years.
Concrete interiors are less subject to damage, and easier to wash down.