i see in the other thread that there is talk of
running the AC to get rid of humidity, so i thought
i'd bust this topic out into it's own thread...
is there any significant difference in cost between
running a dehumidifier and the AC?
my guess is that in our case that the cost would
be different, but the tradeoff against having another
machine to maintain or purchase might make it not
worth the bother for as little as we use it.
the cost would be different because when we run the
AC two motors are running whereas if we had a separate
dehumidifier only one would be running (and it might
be a lot more efficient).
On Friday, July 17, 2015 at 9:34:58 AM UTC-4, songbird wrote:
It comes down to this. If you want heat removed from the space
too, then AC is the way to go. If you want to maintain the temp
then a dehumidifier is the solution. Actually, the dehumidifier
will be adding some heat to the space from the electricity used to
run it. If it's central AC, it will also be able to handle a
large area, it's capacity is going to be many times that of a
dehumidifier. The dehumidifier is most useful in my experience in
places like a basement, where you don't want to lower the temperature
but want to take out the humidity.
I think your motor count is off too. Central AC would have
3 motors: air handler, compressor, condenser fan. Dehumidifier
would have two: compressor and blower. Wall AC unit, not sure
if it's 2 or 3. But the number of motors really doesn't tell
you anything of much use anyway.
our AC is part of the heating system so it has
the outside unit and the inside blower motor. not
sure where the compressor is and if that is a
this house is fairly small and one level so it's
pretty efficient to heat and cool, i just hate running
the AC. in the future i hope to be able to get by
with a small dehumidifier and a small fan instead of
running the AC.
First, that's pretty much what I would have
said. Dehum is used in naturally cool spaces
Wall or window AC typically have one fan motor,
which has a blade on each end of the shaft.
In terms of energy efficiency, the big factors
are type of compressor, and how clean are the
The typical stand-alone dehumidifier also has 2 motors, but they are
smaller. The units are also less effective, but are handy when you do
not want to significantly cool the space while removing excess
It is humid enough here today to want to run the AC or dehumidifier,
but cool enough that to get any dehumidification effect from the AC
the house would become uncomfortably cold - so the portable
dehumidifier is removong about 45 liters of water per day from the air
in the house, maintaining about 40% RH without unduly cooling the
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