"AC" and HVAC" are two commonly used terms in the heating and cooling industry. In fact, they actually overlap. HVAC is a more comprehensive term that stands for heating, ventilation, and air conditioning; AC just stands for air conditioning. Types of Systems Systems can be designed in so many different ways, but are usually found with separate heating and cooling components. If you already have a whole-home heating system but are looking for a new AC, we can help (at a later