Whole House Fan in Sacramento, Calif. is a business that sells fans featuring a Zephyr blade that cools and provide air circulation for an entire house. The Whole House Fan company has nine branches in California, including the one in Sacramento.
A "whole house fan" cools a house by drawing cool air through open windows during the early morning and late evening, then venting warmer air out through roof vents. The fans are energy efficient and quiet and especially useful at purging hot air that builds up in second stories. Because they use approximately 10 percent of the energy used by a typical air conditioning system, they are also less expensive to run.