A/C odors usually occur when the unit is first turned on: not after a few hours.
The odor is usually
caused by algae growing on the coils. The coils need be kept clean, of course;
but beyond that,
there are slow-dissolving tablets which maintain an algaecide level in the drip
pan. In a pinch, you
can use an ounce of the blue Lysol.
I'm puzzled by the fact that this odor occurs, not initially, but after the A/C
has being running
for hours. This makes me think that the odor is not from the usual source,
algae, but from something
mechanical or electrical: something that's getting hot.
Sears' theory about the cooking odors being redistributed sounds like nonsense
to me. As odor
molecules in the air pass over the A/C coils they become entrained in the
condensate and drip into
the drip pan.
I do not suspect your pets as being a part of the problem. Sorry I couldn't be
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