Why Doesn't Volume of Crystal Depend on Temperature?

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In the harmonic approximation, why is the volume of a crystal not temperature dependent? Does it have something to do with the fact that the amplitude of a harmonic oscillator is independent of the frequency?
 
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No, but the mean deviation from the equilibrium position ##\langle q \rangle_T=0 ## in the harmonic approximation. So the volume won't change on the mean.
 

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