America 250 Candidate: Automatic Building Temperature Control
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AUTOMATION HISTORY · AMERICA 250 · REPLACEMENT CANDIDATE
Automatic Building Temperature Control
American milestone: 1880s · Warren S. Johnson · Wisconsin
Status: Replacement candidate. Final number pending chronology audit.
Why it belongs in America 250
Warren S. Johnson developed electric temperature indication and increasingly automatic building-temperature regulation in Wisconsin. His 1888 U.S. patent described a system for automatic regulation of heat using electrical control and fluid pressure.
Connection to automation
Johnson's systems introduced feedback-based environmental control into buildings, a direct ancestor of automated HVAC control and building-management systems.