For the most part, the PE-HVAC version of the Eden language is the same as the Equipment Modeling version. Symbols created under either discipline call the same primitive to define the actual graphics of a symbol. Of course, global variables and keywords are different in HVAC from those in Equipment Modeling. Also, the tutorial interface and nozzle primitives have been disabled in PE-HVAC, and the new primitives STORE_HVAC_PP_DATA and DEFINE_HVAC_SYMBOL_TYPE have been added. User functions have also been provided to allow for the flat oval shape commonly found in PE-HVAC and to place segmented tori shapes.