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A home that is still 82°F at 9 p.m. after a hot day presents a different cooling problem than a home that is 82°F at 2 p.m. That distinction is central to the whole house fan vs ac decision. Air conditioning removes heat from indoor air regardless of outdoor conditions. A whole house fan uses cooler outdoor air to flush stored heat out of the living area and attic, making it exceptionally effective when evenings and mornings cool down. Neither system is automatically the better …