Older Than deck / Inventions and everyday things
Air conditioning (Carrier)
First installed
1902
Willis Carrier’s first system controlled humidity in a printing plant.
Sources and checks
Checked 2026-10-21: Researched by Codex (two independent publishers, verbatim quotes); every counted quote re-found on its page by the server check (content-verify); scope and plausibility reviewed by Claude (AI build agent). Quotes are short passages from each source; for dates the quote is the year as printed, read in context.
“1902”Carrier: source, retrieved 2026-10-21; quote re-found by the server check
“1902”American Society of Mechanical Engineers: source, retrieved 2026-10-21; quote re-found by the server check
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