A method of exterminating organisms is provided utilizing heated circulating air. First, a determination is made as to which enclosed areas of the building or other structure are to undergo extermination. This step defines an application zone. Next, a desired elevated
temperature limit is established for heated air that is to be circulated through the application zone. Heaters are provided in
airflow communication with the application zone, and circulation fans are positioned throughout the application zone to move the heated air for proper
heat distribution. The heaters utilize an amount of recirculated air already present in the application zone to
cut down on the amount of energy needed to raise the
air temperature within the application zone towards the desired elevated
temperature limit, and to eliminate the need for high CFM
airflow heaters to achieve
air temperature elevation. The temperature at various nodes within the application zone may be monitored to allow personnel to redirect circulating
airflow within the application zone to balance out areas of higher
air temperature with areas of lower air temperature. The method takes
advantage of
convection heat transfer to raise the temperature evenly within an application zone, minimizing
temperature stratification which could result in ineffective pest extermination and / or damage to equipment and facilities.