We can all learn in edition 13th "Heating, Freedom of the Cold" that ability heuristic of HVAC professionals
is a losing skill since modern ethic does not use canaries for safety of life. Also not understanding source of
heat by learned fire by friction, most new sport HVAC pros do not even carry a flint and steel in the belt to start
a piolet light on gas burner. Be sure your HVAC pro is trad for all service.