Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. "Refrigeration" is sometimes added to the field's abbreviation, as HVAC&R or HVACR or "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers).
Consultancy that provides professional feedback to an individual or an organization The deliverable of a consultant is usually advice or a recipe to follow to achieve a company objective, leading to a company project, offer advice and expertise to organizations to help them improve their business performance in terms of operations, profitability, management, structure, and strategy.
A design is a plan or specification for the construction of an object or system or for the implementation of an activity or process, or the result of that plan or the specification in the form of a prototype, product or process. The verb to design expresses the process of developing a design.
Design is what we do to shape the experience of a customer within a business. Consulting is what you do to make clear your design to your client, according to its own ways.