WHAT IS IT?
The most common central cooling system is a split system, which includes an outdoor cabinet containing a condenser coil and compressor, and an indoor evaporator coil, usually installed in conjunction with your furnace or air handler. The compressor pumps a chemical called refrigerant through the system.
HOW DOES IT WORK?
The warm air inside your home blows across the indoor evaporator coil and the heat energy from the air transfers to the refrigerant inside the coil. Think of the refrigerant like a sponge, absorbing the heat from the air. As a result, the air is now "cool". The cooler air is circulated back through the home providing comfort. The refrigerant is pumped back to the compressor where the heat absorbed by the refrigerant is released and cycle begins again. Moisture that contributes to humidity is also condensed out of the air.
Your cooling system is usually combined with your central heating system because they share the same ductwork for distributing conditioned air throughout your home.