Open Studio Ruby code - getting the existing HVAC air loop template

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Hello, I tried using AI as a starting point to code an ASHP measure on Ruby to be used on Open Studio. Two lines of code are:

thermal_zone = thermal_zone.get
existing_template = thermal_zone.airLoopHVACTemplate

The second line is throwing an error, as the method "airLoopHVACTemplate" is undefined. I've been unsuccessful in finding documentation explaining this method - does anyone know what alternatives could be used to achieve what I am hoping to accomplish (get the existing HVAC air loop for the thermal zone)?

Thank you!