Heating, Cooling & Refrigeration · Recorded milestone
CFC refrigerants
Recorded year1928
Thomas Midgley's Freon makes refrigerators safe, but later depletes the ozone layer.
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Led to
- Window air conditionerRecorded · 1932enables
- Teflon (PTFE)Recorded · 1938enables
- Car air conditioningRecorded · 1939enables
- Home freezerRecorded · 1940enables
- Aerosol hairsprayRecorded · 1948enables
- Aerosol spray paintRecorded · 1949enables
- Asthma inhalerRecorded · 1956enables
- Ozone hole detectedRecorded · 1985enables
- Montreal ProtocolRecorded · 1987enables
Sources & evidence
Dataset updated 2026-10-18. This individual record has not been separately re-reviewed.