Stewart wrote:
Jim, he has already been advised that he will need air conditioning in the
summer because of the amount and quality of the insulation - solar panels
should operate this.


He doesn't. What he does need is shade from midsummer sunlight -
overhanging eaves, and mass inside the insulation. Then open windows at
night when its cool, and seal up and shutter/curtain down by day.

works a treat here.