The best replacement for hot air is cold air.

The best alternatives to hot air are rated as following:
★★★★★  cold air
★★★★  hot water heat
★★  helium
★★  cold air humidifier
★★  soldering iron
★  hot water heating
★  baseboard heat
★  hot water
★  baseboard
★  cool air
  ir rework
  radiant heat
  hydronic
  infrared rework

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Google Trends

Scale is based on the average worldwide traffic of hot air in all years. Click on graph for more.
hot air
cold air
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