HVAC systems are essential for pharmaceuticals because they provide a controlled environment for the production and storage of drugs. HVAC systems help maintain a consistent temperature and humidity level, which is critical for the stability of pharmaceuticals. They also help reduce the risk of contamination by filtering out airborne particles and controlling the air pressure. Additionally, HVAC systems help reduce energy costs by providing efficient cooling and heating. By controlling the environment, HVAC systems help ensure that pharmaceuticals are produced and stored safely and effectively.