Other

Harold F McKnight

Richard Ferguson

Harold R Johnson

An underground duct is connected to other ductwork and controls associated with a building for automatically selectively passing outdoor air through the underground duct to the normally outdoor coils of a heat pump, recirculating air through the underground duct to the heat pump outdoor coils and back through the underground duct, and passing outdoor air directly to the heat pump outdoor coils and also passing outdoor air through the underground duct to recondition it, in order to achieve optimum heat pump efficiency for selectively heating and cooling the building. Alternatively, air from the underground duct or from outdoors is selectively passed directly into the building for optimum cooling thereof while a dehumidifier is used to remove latent heat from the air; and other heat sources may be used with direct recirculation of air through the building and addition of a portion of tempered air from the underground duct for slightly pressurizing the building interior with heated air.

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Charlotte, NC, United States of America

Harold F McKnight