The 1960s brought sweeping changes to the U.S. politically, socially, technologically, and culturally. Vietnam, the U.S.-Soviet Cold War, the race to get a man on the moon, civil rights, fast food, student marches, and commercial use of computers filled the mainstream media.
Air conditioning, which had taken hold of consumer interest in earlier decades, was moving on a fast track. Equipment was refined with new components for improved performance and serviceability.