Back in the day, HVAC systems were designed to be stout, longevity was the main focus, and concepts such as operating costs and efficiencies were virtually non-existent. The driving force was purely “How much will it cost and will it last?” Interest rates and return on investments were left to the bankers and stockbrokers.
As the industrial revolution proceeded to where things are today, the world of business began to analyze effective measures to maximize profit. From a construction perspective, there are trade-offs with respect to material and equipment that engage the concepts of first cost and longevity.
Via Joan Tarruell