Testing, Adjusting, and Balancing (TAB) is a method that is used to make sure air conditioning and heating systems work properly and safely. It's done by professionals who use special tools to measure and adjust the air pressure and temperature inside a building. Testing makes sure the system is set up correctly and running properly. Adjusting makes sure the system is running the right way and doing the job it's designed to do. Balancing ensures that the air is spread evenly throughout the building. TAB helps to ensure that the air conditioning and heating systems in a building are running smoothly and efficiently, making the environment more comfortable.