hot air

noun Informal.
empty, exaggerated, or pretentious talk or writing: His report on the company's progress was just so much hot air.

1835–45 for literal sense Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hot air
informal empty and usually boastful talk

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

hot air

Empty, exaggerated talk, as in That last speech of his was pure hot air. It is also put as full of hot air, as in Pay no attention to Howardhe's full of hot air. This metaphoric term transfers heated air to vaporous talk. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The point was rhetoric is bull as it is it as empty as the hot air of opinion.
Hot air rises, vents out the top of the shower stall and sucks cooler air in
  from the bottom.
The anti-icing system prevents ice from forming by blowing hot air from within
  the compressor of the engine.
Hot air rises, so even if you heat the top of the house, you still need to run
  the furnace to heat the lower floors.
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