Leonardo da Vinci, the renowned Italian polymath, made significant contributions to the field of HVAC. He designed a water-driven fan to ventilate a suite of rooms, demonstrating his understanding of the importance of air circulation and exchange. Da Vinci’s work on fluid dynamics and mechanical systems also laid the foundation for later innovations in HVAC technology, such as air conditioning and refrigeration. His legacy continues to inspire engineers and designers working in the field of HVAC today.