Abstract: Apparatus which may be used year-round for dehumidifying air in the enclosed space of a building to comfortably allow a higher temperature during summer conditions, for exchanging air in the enclosed space year-round with fresh air to provide a more healthful environment within the building and for selectively humidifying the air when desired at certain times of the year. The apparatus includes a fan mounted on or otherwise adjacent the basement floor or other bottom floor and a conduit connecting the fan outlet to an opening in an outside wall for removing stale relatively damp air from the bottom floor level and discharging it out of the building. A humidifier is provided in flow communication with the fan and connected through another conduit to the enclosed space. A valve connected to both conduits provides selective humidifying of the air in the enclosed space.

Abstract: An apparatus which may be used year-round for dehumidifying air in the enclosed space of a building to comfortably allow a higher temperature during summer conditions and for exchanging air in the enclosed space year-round with fresh air to provide a more healthful environment within the building. The apparatus includes a fan mounted on or otherwise adjacent the basement floor or other bottom floor and a conduit connecting the fan outlet to an opening in an outside wall for removing stale relatively damp air from the bottom floor level and discharging it out of the building. Vents as needed are provided in upper floors for circulating relatively dry air downwardly toward the bottom floor. The air extracted is replaced by fresh air through cracks or the like in the building or by an opening provided in an outside wall at an upper level of the building.