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Dehumidifier - add to HVAC or stand alone

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Dehumidifier - add to HVAC or stand alone tom carr 03-25-2008
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Posted by kool on March 27, 2008, 6:19 pm

>I have been reading about the humidex system at this site:
> http://www.humidexhome.com/index.cfm
>
> What they are saying seems logical. They say moisture sinks, and
> that by sucking air from a vent in the floor, down into the crawl
> space and thus also forcing the air in the crawl space out of the
> house, you reduce moisture in the house without running a
> dehumidifier.
>
> It seems to me you could do the same thing with a fan blowing air out
> of the crawl space and a vent in the house floor, without spending
> $1200 on their unit.
>
> This raises one new question though. If moist air sinks, why are
> bathroom fans in the ceiling?

Would you want your exhaust fan in the floor? It can be done for a price!
Heat rises, moist sinks,cold falls and shit stinks!



Posted by Stormin Mormon on March 27, 2008, 6:28 pm
Will the outside air (coming in) be less or more humid?

It's possible that a vent fan drawing humid air out of the crawl space may
reduce the humidity in the home. Easy enough to try it, I guess. Let us know
what works out.

Does moist air sink? Well, fog travels along the valley. Not sure that
applies.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.


I have been reading about the humidex system at this site:
http://www.humidexhome.com/index.cfm

What they are saying seems logical. They say moisture sinks, and
that by sucking air from a vent in the floor, down into the crawl
space and thus also forcing the air in the crawl space out of the
house, you reduce moisture in the house without running a
dehumidifier.

It seems to me you could do the same thing with a fan blowing air out
of the crawl space and a vent in the house floor, without spending
$1200 on their unit.

This raises one new question though. If moist air sinks, why are
bathroom fans in the ceiling?



Posted by Hot-Humid on March 27, 2008, 9:16 pm

Here's an interesting paper on this topic:

http://www.buildingscienceconsulting.com/resources/mechanical/hvac/conditioning_air.pdf



Posted by tom carr on March 28, 2008, 11:51 am
On Mar 27, 9:16 pm, hates...@hatespam.com (Hot-Humid) wrote:
> Here's an interesting paper on this topic:
>
> http://www.buildingscienceconsulting.com/resources/mechanical/hvac/co...

Thats great. Thanks so much. I will read it in detail later today.

Posted by Old & Grumpy on March 28, 2008, 12:09 pm
Tom do you self a fever get portable unit at Home Depot
and put it any room that is convenience to you.
Forget about integrating into AC system unless you are
looking for problems with AC, it does not need to be in
any specific place your central air will move the air through
out of your home. If you can put it close to return air of AC
Tony


> My house is not extremely moldy or humid, but my wife has developed a
> bad mold allergy and we have to get the house less humid before the
> weather gets warmer in May. I have talked to several HVAC people
> about adding a dehumidifier to the main system. This will be
> expensive but I will do it if I have to.
>
> One guy told me that one stand alone unit often does the trick. I can
> buy one of these at Home Depot for about $160. They are noisy and you
> have to empty them frequently though and I don't really want one
> running in the house. Then he told me something I am questioning, and
> this is my real question for you. My house has a crawl space, just
> about 3 feet high. I put plastic down years ago. This fellow told me
> I could put a stand alone dehumidifier in the crawl space under the
> house and it had a good chance of solving my problems and lowering the
> humidity in the whole house. Does this make sense?



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