Hey folks,

I'm in a doublewide where the AC unit has been running, but I have
some questions on filters. The home was bought new. Please pardon my
ignorance on this subject, but no one told me much about this unit or
what i needed to do to maintain it. I fully expect that I haven't
been doing all I should.

First, it is an air/heat unit fully enclosed. That is, it's next to
the laundry room, without any doors into it or the water heater. The
wallboard for the water heater had screws to remove it for access, but
issues with water led me to remove this panel for easier access. The
only other access is through a grill of sorts in the next panel. This
is where I can see the a-coil I think its called.

Our home is sufficiently cooled I think, but there is a great deal of
dust in the laundry room, and "dust bunnies" in and around the AC
unit. The "grill" does not have any kind of filter behind it. The A-
coil itself has two filters that we clean periodically. But I think
the entire a-coil really needs cleaned and new filters need to be put
on it.

Now I have noticed that only a few ducts in the house itself are
really providing any cooling, and the AC will run indefinitely unless
we turn it off. It doesn't seem to pay attention to the settings on
the thermostat anymore.

I'm pretty sure Ive done something wrong...something needs cleaned,
and I'm missing a filter somewhere. I think the "grill" into the wall
should have a filter as this is where air is being pulled in from it
seems. Ive seen these filters at places like walmart, but no idea if
I needed one, or where it should go.

Yes, I have no clue. Can someone tell me what I need to do adequately
care for this system? I surely don't want high repair bills or even
high maintenance bills. A nice "you need to do this" from the
manufacturer would have been helpful. Where can I buy these metallic
a-coil filters, how do I check and clean the floor registers, and do I
need an additional filter for the intake?