Solar Assisted HVAC for Toyota Tsusho South Africa By: Shaun Worthmann PrEng, BSc, CEM, CMVP, CRM Toyota Tsusho Africa (Pty) Ltd (TTAF), established in 1999, is a wholly owned subsidiary of Toyota Tsusho Corporation (TTC. TTAF manufactures Wheel and Tyres assemblies, Airbags, Rubber Linings and Brakes. TTAF consumes an average of 154,186.73 kWh per month. Toyota Tsusho, conducted a detailed energy audit in which air-conditioning was found to have the highest potential for energy savings and by upgrading the system and adding Solar Cool technology the HVAC load could be reduced resulting a net plant energy reduction of 17%. Based on the financial feasibility TTAF have invested into KwaZulu Natals’s (South Africa) first solar assisted heating ventilation and air-conditioning system (ACS). The Solar Cool technology was pioneered in the USA with corporate and patent rights held jointly by USA and UK based companies. This paper focuses on the monitoring of the energy ACS as installed. It developed base lines and determined the savings following a designed M&V process. The monitoring and evaluation established the savings, financial results and respective payback periods and other financial indicators.