Re: Corugated Al roof sheets for batt boxes
yes they are good insulators, for your situation, the problem is your ambient temperature. to have cooling the outside air must be able to absorb the heat generated.
if your ambient temperature is high you need to think in terms of a swamp cooler.
I have a liquid cooling system, with a radiator. I have a swamp cooler attached to the front of it, for climbing long mountian passes, in the summer
I am in the Seattle area, we only get Hot in July though Sept, and average of 75.