A plenum flooring system installed over high density insulation panels, preventing heat loss to ground and intrusion of ground moisture. The system includes one or more flooring segments, each containing at least one surface opening to the plenum space, and a plenum ventilation system. The ventilation system includes a blower and air inlet openings in seals arranged along the perimeter of the plenum flooring segments at the walls of the interior of a poultry house. The blower withdraws air from the plenum space through the surface opening of the flooring segment and discharges it into the poultry house, creating a continuous flow of air to maintain uniform flooring surface temperatures and remove moisture that migrates to the plenum space from manure on the perforated flooring surface due to moisture gradient, then a refrigerated dehumidifier/air circulation unit to condense moisture in the air and discharges that liquid to the house exterior.
