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What is a whole house fan and how does it work?

A whole house fan is a ventilation system installed in the ceiling that helps cool a home by drawing in cooler outdoor air and expelling hot indoor air into the attic. Whole house fans work by creating negative pressure inside the house when turned on, usually in the evening or early morning. Here’s the process:

  1. Windows Open: Open windows or doors to allow cooler outside air to enter.
  2. Fan Operation: The fan pulls hot indoor air into the attic and expels it through attic vents.
  3. Air Circulation: Cooler outdoor air replaces the hot indoor air, lowering the indoor temperature.