On Jun 17, 12:08*pm, wrote:
On Jun 16, 9:01*pm, Red Green wrote:





"Joseph Meehan" wrote :

* * Different areas of the world get different results and certainly
different vents (inlets) make for differences in results.

* * Frankly I have not found that power vents are of much if any use.
Proper generous static venting seems to work just as well without
noise and electricity. *The worse situations I have seen is when power
vents end up disrupting the natural flow and can even increase the
temperature.

* * The real differences I have seen is poorly vented areas.

* * Overall yours does not seem to be bad.

* * If you really want to do something make sure it has inlets greater
* * than
the minimum required and that thefanis not short circuiting the
natural air flow.

or sucking the AC out of the house via access, vents (stupidly)
terminating in theattic, etc.

"z" wrote in message
..
..
got a remote reading thermometer and stashed it in theatticto see
what's happening. now i'm wondering what i should expect.

normalish 50 year old ranch house, connecticut. 1500 sq feet more or
less. old central AC, not particularly powerful or efficient. normal
amount of insulation, i.e. less than would be optimum but normal for
the period. powered ventfan, mushroom style. soffit vents, gable
vents, etc.

on the wise advice proferred here last year, i upped the temp on the
thermostat for the ventfanfrom 80 degree to about 100 IIRC.

OK; so during the final months of *winter, when i had the
thermometer, there was a maximum of about 20 degrees difference
between the house and theattic.

lately, when it's warm, often 20 degrees difference, obviously in the
opposite direction. during a hot spell last week, when it was 90+
outside,atticgot up to 120; house got up to 87 (AC off during
daytime).

so, is this reasonable/expected for poweredatticvent? would bigger
fando better?- Hide quoted text -

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He doesn't say what the temp was outside during the final days of
winter, but if the temp diff between theatticand the house was only
20 deg, I hope it was not very cold outside, as that means theattic
was at about 50 deg. * *If it was cold outside, *I'd expect a much
bigger temp difference between theatticand the inside of the
house.

Probably the best thing that could be done here is to increase the
amount ofatticinsulation. * That will do a lot more to keepattic
heat out of the house than installing a biggerfan. * Plus you get
benefit not only in summer, but also with reduced heat loss in the
winter.

I also second the advice to make sure there is adequate intake
opening, ie soffit, gable, etc. * If there isn't, you not only reduce
the cooling capaciyt, but you can be sucking air from inside the house
through any gaps, openings around fixtures, etc.- Hide quoted text -

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i was afraid you'd say something like that. is installing more
insulation as big a PIA as it looks? to make it worse, the previous
dwellers laid plywood over the joists to provide flooring for storage.
at least they didn't bother to fasten it down.