Method of controlling air temperature for making seals

A bag machine for forming bags from a film that follows a film path through the machine, comprising:

• an input section located on the film path;
• a sealing section, located on the film path down stream of the input section;
• an output section, located on the film path downstream of the sealing section;
• a controller, connected to control the sealing section;
• and
• wherein the sealing section includes a sealer that includes a heater block, a manifold downstream of the heater block, and an air flow path extending from the heater block to the manifold, wherein air is heated in the heater block in response to a control signal provided by the controller to the heater block, and wherein the heated air flows downstream through the air flow path to the manifold, and wherein the sealer includes a temperature sensor disposed in at least one of the air flow path and the manifold.