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The Foundry's Tinderbox 1 plugin set includes a "HeatHaze" effect.
I don't know if there is a 64 bit version for CS5, but the 32bit version works pretty well.
Thanks joe bloe,
I did not know the English word for it - heat haze. Knowing it now, I found this tutor on YouTube:
It looks good enough for what I need, I will try it now.
I have tried the approach in accordance with the YouTube video, and it works very well. It uses a fractal layer as a displacement map. Looks realistic enough for me.
There's also a sweet tutorial on aetuts+.
It seems to be quite old, I didn't try the method but it seems to work really well and gives nice realistic results.
Question actually comes up often around here so a search will yield several old threads. The effect is often misconstrued as a blur, careful not to do that, it's an atmospheric aberration, a refractive disturbance, known technically as Schlieren Effect.
More than you want to know: