Effect of temperature on solvent efficiency:

Solvent efficiency is measured through α, the associative retention. It is ratio of adjusted retention time or partition coefficients.

α =  X ₂′/X ₁′ = K₂/K₁

α is temperature dependent, it might be constant over a limited temperature range. The distribution constant decreases along with increasing temperature i.e, the fraction of the solute within the gas phase will rise and therefore, the elution time will decrease. This output in decreased separation because it is the liquid phase that performs the separation. No separation occurs within the gas phase. For achieve better separations, lower temperature should be used. A Lower temperature means more liquid phase interactions, more separation and longer time of analysis.