Our whole house fans use a fraction of the energy of expensive air conditioning units. These high-powered fans will promote airflow in your attic and living space to cool your home and eliminate hot, stale air.
Insulation level/tightness of the house– Good insulation will take the house longer to heat up, but once the materials are warm, it takes a lot longer to cool down. Good insulation will need to be cooled nightly or will have trouble releasing the heat. If the attic/walls/ insulation/etc...