Unless you were involved in the building or design process of the home in which you currently live, there's a decent chance you don't know what kind of HVAC system you have. Many people simply moved into a home and are making do with whatever is currently there.
While this may indeed work, it is often not the most optimal solution.
Carolina Climate Control here in Charleston has a helpful blog on this very topic and can help you not only what system you have (Heating and Cooling Split Systems, Ductless Mini Splits, etc.) but also their pros and cons. Click the link below to check it out for yourself!