"Graven Water" <pbbl@[EMAIL PROTECTED]
> wrote in message
news:20080625155115.6E4124138E@[EMAIL PROTECTED]
> "Stormin Mormon :)"
> <cayoung61**spamblock##@[EMAIL PROTECTED]
> wrote in message
> news:g3tmlv$90n$1@[EMAIL PROTECTED]
>
>> Every central AC (or mini split) will reduce the humidity.
>
> I need to reduce the humidity for allergy reasons, not just for
> comfort. So it has to be at least 50% or below, maybe 40%, dust
> mites die with 40% humidity. And I need to be able to reduce the
> humidity when it's cool; yesterday it was 67F and 72% RH indoors :(
Get somebody who knows what they are doing to correct the refrigerant
charge
in your cooling system, and do the calculations to insure that the system
is
not oversized for your home. As far as the dust mites, mold and mildew
control, and to promote a healthy home, read the stuff written by Lew
Herriman on humidity control and mold avoidance.
> So I'm not sure if there are central AC units that can do this, to be
> energy efficient they would have to have an option to either direct
> inside air or outside air over the condenser. I could run a
> central AC with a very low temperature threshold and run the heater
> at the same time, but that would be wasteful.
A correctly sized, and installed cooling system will provide all the
humidity control you need without having to run at rediculously low temps.
The symptoms your discribing are telling me that you system is probably
oversized and not charged correctly... probably grossly overcharged.
> I do have forced air gas heat, and it's good to know that the noisy
> part of an AC can be outside, and it can use the blower in my
> furnace.
The new systems are so quiet that most folks refrigerators make more noise
than their refrigerators do.
> I'm not sure though whether I have to have a separate whole-house
> dehumidifier also.
Not with a correctly sized and properly installed cooling system.
> It would probably be too hot to have JUST a whole-house dehumidifier.
> It doesn't get horribly hot in here without AC or dehumidifier - I
> got the roof ventilated and that helped to cool things down. But it
> is humid here in the summer and if I were dehumidifying from 70% to
> 40% I suspect a whole house dehumidifier would be making the heat
> inside a lot worse.
I am in rural south Mississippi, and humidity is a real, year round issue.
Currently the ODT here is 90 with a heat index of 104
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