Using IR blocking films (like the ones that they use to tint car windows, preferably the type that use static cling instead of adhesive because they're far easier to apply) on any windows helps to keep the incoming heat down during the day, Having airflow through the house at night with open windows or some form of vent, just make sure to add in bug nets to block any intrusive animals. The addition of louvres (solid panels that have angled plates in them to block sunlightbut allow airflow) to the outside of windows can help keep temperatures down as well.