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Posted by z on June 18, 2008, 4:17 pm
On Jun 17, 12:08=A0pm, trad...@optonline.net wrote:
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156$4c368faf@roadrunner.com:
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> > > =A0 =A0 Different areas of the world get different results and certai=
nly
> > > different vents (inlets) make for differences in results.
>
> > > =A0 =A0 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. =A0The worse situations I have seen is when po=
wer
> > > vents end up disrupting the natural flow and can even increase the
> > > temperature.
>
> > > =A0 =A0 The real differences I have seen is poorly vented areas.
>
> > > =A0 =A0 Overall yours does not seem to be bad.
>
> > > =A0 =A0 If you really want to do something make sure it has inlets gr=
eater
> > > =A0 =A0 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.
>
.
> > > ..
> > >> 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 =A0winter, 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 th=
e
> > >> 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 -
>
> > - Show quoted text -- Hide quoted text -
>
> > - Show quoted text -
>
> 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. =A0 =A0If it was cold outside, =A0I'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. =A0 That will do a lot more to keepattic
> heat out of the house than installing a biggerfan. =A0 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. =A0 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 -
>
> - Show quoted text -
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.
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