AJ Baker & Sons Pty Ltd | 2,959 followers on LinkedIn. An Australian fourth-generation family-owned company specialising in commercial refrigeration and air-conditioning. | AJ Baker & Sons Pty Ltd is a fourth-generation, family-owned Australian company specialising in commercial refrigeration and air conditioning since 1920. With offices in Perth, Brisbane, Melbourne, Sydney and Adelaide, we deliver end-to-end installation and maintenance services across supermarkets, food service, hospitality, entertainment and mining. We’re at the forefront of sustainable refrigeration in Australia, with over 100+ transcritical CO₂ systems installations nationally helping clients lower energy costs, enhance reliability and avoid refrigerant price volatility.