I have a heat recovery ventilator – I have the automation run it when there is an anticipated need to cool and the outdoor air is cool and dry enough. I have plans to make a “bypass core” so that it is not as efficient at heat exchanging that I can put in for the summer.


From: J D [mailto:starkruzr@gmail.com]
Sent: Friday, June 28, 2013 1:33 PM
To: JimMH
Cc: misterhouse users
Subject: Re: [mh] Temperature Controlled Whole House Fan


It isn't that it's not a problem. It's that no one seems to think it's a solvable one. Which is so weird, because now we have fairly cheap humidity and temp sensors that could be built into HVAC products but so rarely seem to be.

I don't know why house exhaust fans are never built into home HVAC systems. It seems to me they'd be a cheap addition that could save a lot of money.

On Jun 28, 2013 1:29 PM, "JimMH" <jskinner58@sbcglobal.net> wrote:

I would like to automate my whole house fan but I have a couple issues ...

1.  How do people let air into the house?  This normally requires at least a
couple open windows.  But I don't want to leave the open all day or night.
I usually run the fan at night when it cools down and then shut down the fan
and close the windows in the morning.  The days can get quite warm so I want
the windows shut then.  I have casement windows so could add some gear
motors to a couple windows but that makes the project more complex -
especially getting the control signals to the motors.

2.  I live in the midwest and humidity is an issue that must be factored in.
If the dew point isn't below 65 (preferably 60) there isn't much point in
ventilation.  Not a real problem as that is easy enough to do.  It's just
that no one in this thread has mentioned it.  Apparenlty humidity isn't an
issue for others?

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