Timeline...

February 1928 First sale of small air conditioning unit.
1928 Plant expansion for Carrier Engineering and the start of air conditioning in office buildings.
Summer 1929 First railroad car air conditioning system installed on the Baltimore & Ohio's Train #5275.
1930 Carrier Corporation formed through the merger of Carrier Engineering Corp. with Brunswick Kroeschell Co. and York Heating & Ventilating Corp.
1932 First "Atmospheric Cabinet" room cooler is marketed by Carrier.
1937 Carrier Corporation headquarters moved to Syracuse, N.Y. from four sites in New Jersey and Pennsylvania.
August 12, 1939 Patent issued for the "Conduit Weathermaster System" the air distribution system that made possible the air conditioning of skyscrapers.

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