Dear Friends,I am learning Autocad and I need hvac blocks.  Kindly tell me whereI can download these blocks like chiller, Ahu, Compressor etc for autocad 2012 and tell me how to save this in auto cad for the use in Hvac P&ID.

You can check out the CAD Blocks library right here at the CADforum and see if there are any HVAC blocks you can use.  The blocks should already be in DWG and/or DXF file format (good to use in AutoCAD).Download the blocks to a folder on your computer.Use the INSERT command to bring a block into your drawing.If you don't find the blocks you need you can always look over at the Cad Block Exchange Network or you can create them yourself.  It's easy once you know how.