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Posted by mm on March 14, 2006, 1:35 am
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>Hello,
>The past weekend, the temps in Georgia hit the upper 70s and
>the second floor of our 2-floor home was about 10 degrees
>warmer than the first floor.
>Also, the attic (which houses the central a/c and heater) was
>extremely hot, lower 90s or so.
>My question is: is this temp increase in the 2nd floor and attic
Yes.
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>normal? This is 2-story house with central A/C and heat - wooden
>w/ front brick.
>Also, are reasonable means to cool down the attic?
>There is an attic fan that was installed by the previous owner, but it
>kicks in
>around 95 F or so. Even then, not sure if it can cool down such a hot
>attic.
A roof fan or gable fan, right. Yes, as long as the motor is still
good (not hard to replace from inside the attic, last an average of 5
or 6 years or more, although I keep thinking they should last longer.)
the fan will cool down the attic, that is, it will keep it from
getting so hot in the first place. I think it is the nicest thing my
house has, although few people have them, and even the guy I asked
before I put mine in didn't think his were much help. But I lived
here before the fan, and I know it lowers the temp of my 2nd floor 10
or more degrees on a hot day. I"M in Baltimore, not as hot as
Atlanta, on average.
I have a vague recollection that mine came preset to lower than 95,
and it's adjustable too. I can't check right now what the setting is.
I also have a switch so I can turn off the fan in the spring and fall.
This lets the attic get warmer than otherwise, and the heat heats the
house a little bit. Maybe I do need more than the 6 or 8 inches of
fiberglass that I have.
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>THANKS
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Posted by buffalobill on March 14, 2006, 9:55 am
sometimes the attic fan is on a separate circuit. in a finished attic
with a floor it's easier to find out what wattage or amperage the fan
wants by reading its electrical plate. you could have your electrician
wire the attic exhaust fan on a (thermostat/center off/on) three
position switch on the second floor. if the fan is powerful enough it
can exhaust unwanted heat from the attic and the house if the doorway
to the attic is open, but depending on where it usually gets its makeup
air other attic inlets may need to be closed during this cycle. stand
in the attic doorway and see which way the air goes for the best ideas.
look up whole house ventilation but keep any more fans up in the attic.
motorized screened louvers may provide an intake in the attic.
see also: http://www.buildingscience.com/resources/homeowner.htm
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>The past weekend, the temps in Georgia hit the upper 70s and
>the second floor of our 2-floor home was about 10 degrees
>warmer than the first floor.
>Also, the attic (which houses the central a/c and heater) was
>extremely hot, lower 90s or so.
>My question is: is this temp increase in the 2nd floor and attic