CAD Drawings of Heating, Ventilating, and Air Conditioning Download free, high-quality CAD Drawings, blocks and details of Heating, Ventilating, and Air Conditioning (HVAC) organized by MasterFormat. AutoCAD HVAC drafting samples - Andy's Best CAD Andy's Best CAD. AutoCAD HVAC drafting samples. Home Services 3D Services Projects Procedure Experience Samples Pricing Links Contact. Heating, Ventilation and Air Conditioning drafting samples. The AutoCAD HVAC sample drawings are available to view in 3 different file formats.