HVAC node, air conditioning node and installation, including the calculation data of the size of the expansion pipe bend, the detailed drawing of the support of the insulation pipe installed on the base, the detailed drawing of the support of the riser installed on the wall, the detailed drawing of the support of the water pipe on the ceiling, the detailed drawing of the air duct support of the ceiling, the detailed drawing of the air vent connecting the air duct, the detailed drawing of the reinforcement plan of the air duct opening