I'm having an addition put on my house and I'm considering the "Quiet Cool" line of whole house fans. The fans are quite expensive and price wise two small fans are almost the same price as one larger fan.

My question - would two small fans (of say 750 CFM) be better be better than one large fan (of 1500 CFM)? Is there any benefit to having two fans in different locations of the house?

More Info: The house is about 2,000 square feet split over two floors. I have a low threshhold for noise

  • Does the larger fan have a speed control or is it just on or off?
    – JPhi1618
    Commented May 2, 2019 at 20:29
  • I think it has speed control Commented May 2, 2019 at 20:32
  • 1
    Depends on the house. And the fans. And your tolerance for noise in the key locations. And.... My point is that the question isn't answerable as it is. It's broad and subjective.
    – isherwood
    Commented May 2, 2019 at 20:35
  • I'd lean towards 1 fan. I can't put my finger on it, but two fans seems like it could cause some odd patterns in the airflow. Would you ever have the desire to close off a logical section of the house with doors an only use one fan? I can't picture a good use case for that.
    – JPhi1618
    Commented May 2, 2019 at 20:38
  • 1
    Two fans would fight each other for air and cfm would take a hit
    – Kris
    Commented May 3, 2019 at 3:05


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