Airbenders could not change the temperature of the air. They can control the density, and movement of the air. If they could control the heat, then with enough practice and focus, they could begin igniting things which would essentially give them firebending. They would also be able to prevent firebenders from producing any flames by lowering the temperature of the air around the bender.
I assume you man soundbending, also, airbenders cannot control the temperature of the air. Second, once again, you people never seem to understand. Benders do not control the molecules or particles. They control it as a whole. My proof is that Earthbenders can bend the earth. But the earth is composed of a lot of different things. They can bend things from normal stone, which is usually granite, mica, feldspar, to things such as diamonds (carbon), to clay and dirt, which are made from plant and animal matter that has decayed to the pure nutrients. Sometimes these things are in combined, yet they still bend it.
Again, making hot air (which they can't do), or making a high pressure area would not create sound. Even if they could produce heat in addition to making a high pressure area, they would need a large sum of heat and power, and they would then need to do it faster than a lightning strike. And if by some miracle they manage to pull it off, they would also be damaged because in order to escape from the blast they would need to run faster than the speed of sound. If they were capable of speeds that high, then they would be able to create a sonic boom and wouldn't need to bother with creating heat and pressure to simulate a lightning strike.
Like I said earlier, I am willing to compromise and say the the effects of sound bending are possible by controlling the pressure of the air by somebodies head and causing a pressure ache similar to the kinds that people get while flying on an airplane, or diving to a high depth.
Honestly pressure bending is a much more deadly application than sound bending. Scuba divers (and bridge builders of the early 1900's) often die from pressure. It's called Caisson Disease (coincidentally its also called "The Bends" Lol). When the body leaves a high pressure area too quickly the nitrogen in the body can't dissolve quick enough and then you have bubble of nitrogen gas in your bloodstream and it causes pain, inflammation, and can even lead to death.