How does central air work?

There are two main pieces of equipment: an outdoor compressor and an indoor evaporator. The compressor runs on electricity. It compresses a special liquid, such as Carrier Puron® , creating heat, which escapes outdoors. The compressed liquid is pumped inside to a set of coiled pipes in your air ducts, where it expands (this process is called “evaporation”, although the decompressed, evaporated liquid is kept contained inside the pipes). This creates cooling. The evaporated liquid is pumped back out to the compressor to repeat the cycle.