The air conditioner in a central heating and cooling system provides cool air through ductwork inside your home, by providing a process that draws out the warm air inside, removing its heat. … From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat. Heat goes from hot to cold. To add Freon to your AC, see pictures below.

A typical air conditioning system, often referred to as “central air” or “split-system air conditioning”, normally includes the following:

• A thermostat that controls system operation
• An outdoor unit that houses a fan, condenser coil and compressor
• An indoor unit (typically either a furnace or fan coil) that houses the evaporator coil and fan to circulate the cooled air
• Copper tubing that allows refrigerant to flow between the indoor and outdoor units
• An expansion valve that regulates the amount of refrigerant going into the evaporator coil
• Duct work that allows air to circulate from the indoor unit out to the various living spaces and back to
the indoor unit

Adding Freon to Your AC Unit