What is an AC unit?
In respect to this, what is difference between HVAC and AC?
Put simply, these acronyms are one and the same. While AC is short for air conditioning, HVAC is short for heating, ventilation, and air conditioning. These two acronyms tend to be used interchangeably to describe any air conditioning or heating device, whether it's a window unit or a central system.
Keeping this in view, what is an air conditioner?
An air conditioner is a system or a machine that treats air in a defined, usually enclosed area via a refrigeration cycle in which warm air is removed and replaced with cooler air. In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC.
Split AC: A good high efficiency, zone cooling solution. Good for open concept homes with a few rooms looking to invest in a long term solution. Central AC: Good system if you currently have properly sized ductwork. Cheaper than split AC for cooling a whole home if you still want adequate cooling throughout their home.