I have only about 1000 sq ft of house to cool. I live in NY State. Very
damp here, and in the summer, hot.
I'm willing to pay more for central AC/dehumidifier that's really quiet.
What would be a good quiet model?
On Jun 24, 9:23 am, email@example.com (Graven Water) wrote:
Central AC is a dehumidifier, if AC is oversized and short cycles you
dont dehumidify in which case a stand alone unit is good. Quiet is an
instalers job. You need a load calculation no guessing on size
I ->think he's talking about the sort which doesn't use ductwork.
The compressor is outside, the condenser/fan is inside, looking like a
truncated conventional window AC unit, but these are usually intended to
cool a single room, while the OP is talking about cooling a (small)
Bert Hyman St. Paul, MN firstname.lastname@example.org
The split-sytem idea seems like a good one. I don't think ductless
would work because my house has 2 floors and ductwork would be needed to
the air well. Maybe one can use the house heater fan for the AC and not
have to get a separate fan?
I do want something that's a dehumidifier as well as AC, because often
it's damp here and not hot - the other day it was 67 F and 72% humidity.
So I need to be able to turn on a dehumidifying function separately from
No, I haven't asked this before. Looking on google I'd found some models
of central AC advertised as quiet, about 65 dB (meaning dBA I guess).
Those are probably for a larger house than mine, and maybe I could find a
quieter one. It would be in my garage. The heater fan is in my
garage, it is about 50 dBA and that's plenty loud, the garage is next to my
living space. I suppose the compressor the main noise you get from an AC,
the fan noise is not so bad.
For allergies one is supposed to have humidity about 50%. Are there
central ac/dehumidifier units that will do this?
Looking around I see a lot of portable ac/dehumidifiers, but not central ones.
Every central AC (or mini split) will reduce the humidity. Passing air
through a cold coil will condense some of the humidity out of the air.
What is the heat source in your house? If it's a hot air forced furnace,
you're a candidate for central AC to be added. I know, I did this for six
years, working for someone else. And several AC add ons for friends of mine.
I get the impression, reading around, that a central AC can't dehumidify
without cooling, because the condenser, which is what would heat
the air in a dehumidifier, is outside, being cooled by outside air.
It should be possible to expose the condenser to outside air or
to the inside air, depending on whether you want just dehumidification,
which would heat the air, or air conditioning. So I don't know why a
central AC couldn't also be a dehumidifier. It would have to have a
humidity sensor of course. For my purposes it'd have to be able to reduce
the humidity to 50%.
A *competent* HVAC tech would have already explained all that to you, and
would have built in humidity controls as a standard offering. Keep in mind
that on most normal resi installations, if the system is designed, sized,
and installed correctly, it will have no problem maintaining 75 degrees with
That would be a ductwork nightmare. I've heard of systems that can run AC to
get the humidity percentage, and then run the furnace as needed, to keep the
temp from being too cold. That's wasteful, of course.
What are you talking about Stormin? What would be a duct work nightmare?
To be quite frank [honest] a reputable refrigeration tech could easily build
a add on to your system, but running a third pipe, bringing hot gas to a
indoor coil that is installed after the evaporator. The subsequent liquid
discharge from the reheat coil could be piped [using a check valve] directly
to the indoor evaporator metering device, the suction would remain going to
the outdoor condenser / compressor section with a solenoid valve that could
change the hot gas direction from the outdoor condenser coil to the indoor
The only problem, is you would have more heat coming into the home than is
being removed, but the result is dehumidified air. Using a P/E chart, the
difference would be the heat of compression [and added electrical heat from
the compressor] would be added to the air as it left the system. Eventually
the system would have to change over to nominal air conditioning to 'remove'
the added heat, and then could [if the humidistat is not satisfied] return
Get your credit card out though.
I was getting visions of ducting the indoor air to the condensor, and then
the hot blast from the condensor into the house.
The condensor in the duct work could be done. If there was some kind of
thermostat and a variation on a heat pump reversing valve. Divert the heat
into the air stream when the house needed the heat. I've never seen one, but
it sure seems possible. Great idea, chief.
I just explained how a dehumidifier works.... read above. The only ducting
needed would be maybe a transition between the reheat coil and the
evaporator. The rest would be refrigerant piping so the hot gas discharge
could reheat the cold supply air from the evaporator coil. The actually
temperature leaving the system during dehumidification would be a little
warmer than the air going in. The humidity of the air leaving would be
considerably less. A psychometric chart would be used to determine the
effectiveness of the system.
You did describe a whole house dehumidifier. And, then, I described my
mental concept, ducting the hot blast from the condenser into the house. And
now you're explaining again. How many times would you like to do this? I
mean, you're light on your feet, but my dancing abilities are limited.
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