The hvac element is a child of the systems element. You can submit one or two instances of the hvac element.


  • The hvac_name element must be submitted so that the correct instance of hvac is modified.

  • The total of both the hvac_fraction values must be equal to 1

  • If the heating/type is central_furnace, heat_pump, or gchp or the cooling/type is heat_pump, gchp, or split_dx, you must submit an hvac_distribution element