Perhaps you still remember the first VG Airlines livery design; it had a light grey roof, tailfin and engine cowls with graphite grey texts and a white belly.
But as the client's whish was to change the light grey into graphite grey; the whole livery became more sturdy, young and became a more outspoken appeal. The, previous, light grey design, looked "too matured, too old; like an old man". I pointed my client to the heat problem a dark roof colour will occure but to the client's opinion the image and expression is more important. As I did my duty to point my client to the disadvantage I have to respect the client's whish. Honestly speaking I prefer this final "dark-roof" design much more too.
The solution for the heat problem is to turn on the cabin airconditioning to the highest level; I'm aware it will cost VG more fuel.