Residential AC units in 1914 needed their own room and cost $10K to $50K -- up to $600,000 in today's economy! We've come a long way since then in keeping dwellings habitable in the heat and warm in the winter.
HVAC is the embodiment of STEM - science, technology, engineering, and math all rolled into one. Learn more about HVAC and career paths in HVAC here!