What were some of the key challenges faced by early HVAC system designers and engineers?

Early HVAC system designers and engineers faced numerous challenges, including the need to balance heat distribution, air circulation, and ventilation in buildings. They also had to contend with limited materials and technologies, which made it difficult to create efficient and reliable systems. Additionally, the lack of understanding of thermodynamics and fluid dynamics made it challenging to design systems that could effectively heat and cool buildings. Despite these challenges, early HVAC pioneers made significant progress, paving the way for the development of modern HVAC systems.