Multistack International Ltd (ASX:MSI) is an Australian company that specializes in the design, manufacture, and distribution of energy-efficient heating, ventilation, and air conditioning (HVAC) systems. The company's products are used in a variety of commercial and industrial applications, including data centers, hospitals, and manufacturing facilities. As an Aussie stock, MSI may be of interest to traders on our forum who are looking for opportunities in the HVAC industry.