AutoCAD is a commercial software application for 2D and 3D computer-aided design (CAD) and drafting wikipedia.org

HVAC (heating, ventilation, and air conditioning) refers to technology of indoor and automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. wikipedia.org

Mechanical engineering is a discipline of engineering that applies the principles of physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems. wikipedia.org

Fire Protection Engineering (also known as fire engineering or fire safety engineering) is the application of science and engineering principles to protect people and their environments from the destructive effects of fire and smoke.

The engineering design process is the formulation of a plan to help an engineer build a product with a specified performance goal. This process involves a number of steps, and parts of the process may need to be repeated many times before production of a final product can begin. wikipedia.org

Technical drawing, also known as drafting or draughting, is the act and discipline of composing plans that visually communicate how something functions or has to be constructed. wikipedia.org

Plumbing is the system of pipes and drains installed in a building for the distribution of potable drinking water and the removal of waterborne wastes, and the skilled trade of working with pipes, tubing and plumbing fixtures in such systems. wikipedia.org

An electrical drawing, is a type of technical drawing that shows information about power, lighting, and communication for an engineering or architectural project. wikipedia.org