Using fans to cool your home is energy efficient. After you determine the natural ventilation scheme in your home, you can enhance the effect with the use of active fans. When choosing fans, check for efficiency ratings.
Fans are rated by how much air they can move in a given amount of time. The most common spec is cubic feet per minute (cfm). Calculate how many cubic feet are in your house, room, or attic (length x width x height) to find the proper-size fan.
Fans move air most efficiently when they have a cowling. Cowlings prevent air around the tip of the blades from circling about outside the blades, instead forcing that air forward, yielding much more air for the same power draw.
A cowling on a fan directs airflow and improves efficiency.
Many fans are available at a wide range of prices. Choosing the right unit for your needs can ensure you get the effect you’re looking for.