Last winter, a lot of mold grew inside my room air conditioner, even
though the outside of it was covered for the winter. Evidently there
was still enough warm room air seeping through to cause condensation
when contacting the colder outside parts. Removing that mold took a lot
Would covering both the outside and the front panel of the room A/C
prevent mold growth? Or is there anything else I can do to prevent mold
from growing inside my room A/C during the winter?
(No, removing the A/C unit for the winter is not an option: It's a
through-the-wall unit that is inside a wall sleeve.)
But yes, of course, you can still remove it, get some rigid insulation board
(foam) from a big box store. Hold the board up- against the sleeve while
someone inside traces the sleeve pattern on the foam. Then carefully cut out
a section Carefully cut out the foam so that it will tightly slide in to
the sleeve. Make two so you can put in 2 with an air space between them.
Then seal the outside of the sleeve with tape and plastic.
Clean around the inside with a bleach solution as best you can, clean
the filter and front panel. Then take a plastic trash bag and put it
over the front of the unit sans cover, then put the front panel back
on. I do that in the dining room.
May I give you little experience of my own? The new window Shakers that
manufacture makes them sacrifice clean air for efficiency. In other words
the AC does not drain them use condense water to throw over condenser which
naturally makes it more efficient, "but doing off cycle water remain inside
of some units, when unit is off for longer period of time what happens to
that water it start to grow Mold. It is compromise between cleaning and
efficiency. So next times you purchase window shaker make sure you lock in
health warrantee. Hahahehe
When sealing up the unit for the winter, do two things. Spray the interior
with Lysol or some other mildewcidal air freshener. Then take a compressed
air hose and blow out the water that sits in the evaporator pan. As Tony
noted the modern A/Cs use that water to (noisily) splash on the outer fan to
aid in cooling the unit.
If you let that icky water fester over the winter, especially a warm one,
it's going to be mold city on startup in the summer. Though I don't like
the smell of Lysol for the first day or so of operation, it sure beats the
smell of mold.
I'd sure try it. Has to be reasonably vapor proof. Plastic, and tape.
One apartment complex not far from me has metal covers for the outside
of AC units through the wall.
Christopher A. Young
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