The answer to 'difference between central air and' is that central air conditioning is a whole-home cooling system, while window units or portable air conditioners cool individual rooms. Central air provides consistent, whole-home cooling by circulating air through ductwork, while room units are best for smaller spaces or homes without existing ductwork.
Central air systems have higher upfront costs but are more energy-efficient and provide better temperature and humidity control. Room units are generally less expensive to install but have higher operating costs and may not cool a space as evenly. The right choice depends on factors like the size and layout of your home, your cooling needs, and your budget.