specialized type of air conditioning system designed for environments requiring precise temperature and humidity control, like data centers, laboratories, and A PAC unit, or Precision Air Conditioning unit, is a specialized type of air conditioning system designed for environments requiring precise temperature and humidity control, like data centers, laboratories, and telecommunication rooms. Unlike standard air conditioners that focus on comfort cooling, PACs prioritize maintaining stable conditions to protect sensitive equipment and ensure optimal performance. rooms. Unlike standard air conditioners that focus on comfort cooling, PACs prioritize maintaining stable conditions to protect sensitive equipment and ensure optimal performance.