Write the next sentence in the following story.

How to understand the basic operation of the home air conditioning system
Understand what the compressor does.
The compressor is the heart of a basic home air and heat unit. It pumps vapor refrigerant through the system and maintains the internal pressure of your home unit based on the temperature of it surroundings.
Understand the role of the condenser. This is where the refrigerant goes once it leaves the compressor.