But bear in mind that the opposite occurs in the winter, when
it would be nice to absorb all the heat from the sun and the
surrounding that you can. I understand that the desert gets
really cold in winter, and you generally have to use more
energy to heat up something than to cool it off a few degrees, since
there is a mechanical advantage in BTUs of cooling, but you
usually have to burn something to heat.......

Since he would only need to heat the house at night, it really wouldn't
matter what the color of his house is, however.