Progen Holdings Ltd, an investment holding company, engages in the design, supply, installation, and maintenance of air-conditioning and mechanical ventilation systems primarily in Singapore. It operates through four segments: Products and Installation, Servicing and Maintenance, Rental, and Property Development. The company is also involved in the trading and contracting of engineering works, cooling towers, and air-conditioning and mechanical ventilation systems; servicing and repairing air-conditioners, cooling towers, and other cooling equipment; and supplying and installing cooling fans, cooling towers, and air-conditioners. In addition, it sells and distributes household electrical appliances and air-conditioners; rents and leases leasehold buildings and office spaces; and develops and sells residential properties.