And the first signal of any such issue is the attic fan humming noise.
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Yes using fans to put positive pressure in the house would eliminate pulling conditioned air into the attic but if the ceiling has leaks you ve now turned the problem from exfiltration to infiltration and are pushing hot attic air into the house there s also still the problem of using all that power for something that s not necessary.
Running an attic fan isn t just running any other fan of your home.
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As joe said if the ceiling is perfectly air.
Therefore take this noise issue as an indicator and step ahead to solve it right away.
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There can be issues like motor dis function ball bearing damage and so on.
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With an attic fan you can cool the attic to the same temperature as it is outside greatly reducing the house from heating as quickly.