Abstract: A food storage building (10) having exterior wall surface (55) and exterior ceiling surfaces (65) held in spaced relationship with interior wall surfaces (64) and interior ceiling surfaces (64) to form interconnecting between wall and between wall cavities. Ventilation duct (41) is positioned within the between wall cavities around the base perimeter of wall systems (11). The ventilation duct (41) has a plurality of vent holes (42) for supplying heated or cooled forced air from heat source (40) to the between wall cavities for purposes of holding interior wall surfaces (54) and interior ceiling surfaces (64) above the drew point for the interior atmospheric conditions of food storage building (10).