Indoor mold issues in home

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I have called two air quality pro's to get a price on an assessment and they were $475 and $700. Not including any mold remediation.

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drop in the bucket if you are paying someone who can find the actual problem.

When removing the mold from the walls are you using bleach or hydrogen peroxide and vinegar

You absolutely have a water problem somewhere in the house.

Can’t tell you where but something is going on. Mold just doesn’t form for no reason

Are you on a slab?

Is it more prevalent at certain times of the year?
Have you put a dehumidifier in the closet?

100% sure it’s a hvac issue. Call the most reputable company in your area

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Yea lets say I pay the $700 and they say it will cost $20,000 to rip out a wall and repair a pipe under the tub. Thats not gonna happen so I just pissed away $700

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ok. So how about you stop wasting our time as well. You likely have an AC Unit too big for your house. But you ain't replacing the ac unit so have fun with mold.

Your HVAC is not removing enough water. AC is called an "Air Conditioner" because it removes water and conditions the air. Something is not working correctly in the HVAC.

Not saying this is your problem but this is the reason you don't want to oversize an AC for a home. If you put a 5 ton unit where only a 3 ton is needed the house will cool down too quickly and not circulate enough to remove moisture from the air. This is how you end up with damp walls, damp counters, etc.. You might want to check to make sure you don't have too much AC. Like I said, not saying this is your problem but I would start with the simple stuff first.

What's the humidity like inside during the winter?

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mold issues in the closets

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Doubt you would have a plumbing/water leak in multiple closets. Try leaving the closet doors open to allow air circulation and see if the problem goes away. If yes then you have to figure out how to move or circulate the air in the closets. Harbor Freight sells a cheap moisture meter that may help to assess the situation.

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sounds like HVAC issue, possibly short cycling and not running long enough to remove humidity.

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This is my problem which will be remedied when I replace the AC/heat pump (long term solution).
As a short term solution, I have a portable dehumidifier running to keep the relative humidity around 50%.

I bet 100% it’s a HVAC issue. There is an entire subdivision in League City, TX dealing with this exact problem.