HVAC stands for "heating, ventilation and air conditioning, three functions often combined into one system in today's modern homes and buildings. Airflow Engineering (SI) Ltd, known simply as ‘Airflow – The HVAC Shop’ is a Christchurch based independent supplier of HVAC products. THE ONE STOP HEATING, VENTILATION & AIR CONDITIONING SHOP For Architects, Consultants, Tradies & DIY Home Owners - Airflow