Left: the effect of varying the metallicity on the T − P profile of the atmosphere. The curves are labeled by the value of the metallicity in the atmosphere (1 or 3  ×  solar) and the core entropy, respectively. Notice that entropy on both day and night sides increases with increasing metallicity. Right: the effect of varying the metallicity of the planetary atmosphere on the day-night side cooling. Models are calculated for two metallicities: solar and 3  ×  solar metallicity. The cooling from both the day and the night side decreases with the metallicity. Consequently, the total heat loss decreases with increasing metallicity.