They are advantageous if you need to cool at least three or four rooms regularly. A central AC is fairly quiet when in use because the compressor unit is located outside. If you already have a forced air heating system, you can connect the central AC unit to the existing ductwork. They are easy to control with a wall thermostat. Central ACs require installation by a qualified contractor, and can be fairly expensive to purchase.
Proper sizing is critical.
If you don t already have a forced air heating system, ductwork will have to be installed. The existing ductwork must be properly sized and free of leaks and obstructions for the system to work efficiently. Heat pumps are like conventional air conditioners except they also can provide heat in the winter. There are a variety of types of heat pump technologies on the market. They have a high first cost but are extremely durable, if properly installed, require little maintenance and can last up to 20 years.