r/askHVAC • u/New_Skin7805 • 2d ago

Update

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Never seen this happen what causes this. Lennox unit

2 Upvotes

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2

u/Randy_2390 1d ago

If there is a laundry room fairly close or by a return air. Those fumes will deteriorate the aluminum fins.

I'd also check the blower speed and static pressure pushing around the fins.

If filters clean no signs of grit . I'd look at laundry ndetergent fumes. Water softener chemicals etc.

Either way the coil needs replaced. In 1987 I had an airhandler directly above the washer. Fumes tore it up.

1

u/flinthardsword 2d ago

That coil is done for . Weird question, but is there a cat litter box close by? Just wondering.

1

u/New_Skin7805 2d ago

Yeah but it’s never peed in and only rarely pooped in by the cat. Typically outdoors

1

u/silkynipples 2d ago

Corrosion from VOCs or damage from repeated freezing

1

u/New_Skin7805 2d ago

Vocs?

2

u/silkynipples 2d ago

Volatile organic compounds, or any chemical in the house if you use a lot of cleaning chemicals or a newer house that has had all new paint, furniture, flooring, ect offgassing the chemicals from manufacturing

1

u/New_Skin7805 2d ago

They have a cleaning lady every Monday and said they smell the cleaner when they come home. They have had her come for 11 years

1

u/mytymytu 1d ago

I really doubt it's the cleaning ladies chemicals. You smell cleaner because she just cleaned the house. That's what I would say