I've got some problems with my AC/Heating unit and I would like to
seek your expertise for comments on the problems I have.
My house was built in April 1997 by Centex in Houston, Texas. The
AC/Heating Unit is the Lennox.
The problem is when I use the heater, once in a while, there are tiny
brown particles or flakes like come out from the air vent. This
happened since last November 2003. The problem does not happen all
the time when I use the heater, but only once in a while. Also I
noticed that the tiny brown stuffs come out especially for example,
when I use the air conditioner in the day time and at night time I use
the heater, that is when the problem occurs during the heating, not
the AC operation. I did not notice tiny brown stuffs come out during
the AC (not 100% sure), but I did notice it come out during the
heating. Or when in the last winter during the day time no one is at
home, we turn off the heater, the whole house get really cold, then
when we come back home from work, we turn on the heater, that is when
tiny brown stuffs come out from the vent. After I use the heater for
a while, the problems seem to be lessening. It seems like when the
AC/Heating unit in the attic is very cold, then the first time when
you turn on the Heater, a few tiny brown stuffs come out, after it is
use for a while the problem lessen.
I'm not sure if those tiny brown stuffs come out from all of the vents
in the house, but I only noticed this problem in one of my room
because I have two large white computer monitors sitting directly
beneath the air vent, therefore it is very easy to notice those brown
Last December I found a large dead cork roach inside my air return
duct. I took it out and vacuum behind the air return duct, but still
that has not solved the problem. May be something is still stuck in
my AC/Heating unit???
I called the AC/Heating company to come over and take a look at my
unit today and here is what they say. Can you give me comments on how
truthful on what they told me?
After about 15 minutes inspecting my AC/Heating unit up in my attic,
the repair person came down and told me:
- I have a rusted Evaporator coil and it is normal for the evaporator
coil to rust after 2-4 years. Most houses have rusted evaporator coil
and that most houses have those brown rusted stuffs blowing out of the
vent. The reason many people don't notice the problem because those
brown stuffs are tiny and their house are dusty and it is mixed with
the dust and dirt.
- I asked if it breathing those rust is a health hazardous (like
giving you cancer) in anyway. He says it's probably not.
- The repairperson says that because of the shape and design of my
plenum, it makes the rusty stuffs to be easily blown into my air duct.
- He say that what I'm experiencing with the rust stuffs is normal and
I don't need to replace anything, and accept the fact that there are
actually tiny rust stuffs blowing out of my vent once in a while.
- I asked him what does it take to stop the rust blowing of my vent,
he told me that I have to replace the Evaporator coil, the old small
plenum with the new improved and larger design plenum (which also
include the galvanized emergency drip pan, new transitions, and flood
switch) all parts and labor cost $1400.00 including tax. Is this a
reasonable price ???? The new evaporator coil design is the
horizontal slab, this would also help the rust from blowing out to the
- The repair person also recommend Amana brand for the evaporator coil
and plenum because he say it is the best quality brand
Would you please give me comments and advise on the problems I have
with my AC/Heating unit and how truthful of what the repairperson told
me. Is it normal for some of the house to actually have tiny rust
stuffs blowing out from the air vent?
Thank you very much in advance.