1)   Engineering Power Tools 1.9.8
ENGINEERING POWER TOOLS solves a wide variety of common engineering problems quickly and easily. Over 70 programs and data tables integrated into one easy-to-use package. Categories include Math, HVAC, Mechanical, Electrical, Materials & Structural.
engineering, mechanical, calculations, design, HVAC, math, electrical, materials, conversion, structural,

 2)   Design Master HVAC 6
Design Master HVAC is an integrated HVAC building design and drafting program for AutoCAD. Features include 2D and 3D ductwork drafting, ductwork sizing, pressure drop calculations, and building load calculations.
hvac software, duct design, duct sizing, static regain, duct drafting, 3d ductwork, hvac bim, hvac building information modeling,