Adding a dehumidifier to your HVAC system...

For your whole house or just a room?

On these high 60 low 70 days sometimes I have to kick the A/C on to get the humidity down. Its very rare though.

Can you switch to variable speed? Not sure if the cost difference but should fix the problem.

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Hardwood floors are buckling a little too...house is raised.

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I'd start with making sure water isn't getting under house. Then a vapor barrier put in place if unpinning is in place to keep most critters out. The dirt is LOADED with near infinite moisture. Even worse is standing water. You either want under the home completely open for the best airflow possible or a barrier with underpinning and as much airflow as possible. People keeping the a/c at 69 isn't helping at all by dropping the temp of the subfloor/floor below well below dewpoint for june-aug. That can certainly cause buckling. Ambient dewpoints in the south in the summer hover around 70. Add in a little moisture from the ground and it easily hits 80* making that 69* floor look like a great place to drop moisture.

The best is encapsulated (completely closed in and conditioned with the a/c or dehumidifier). But this is $$$ and in, some places, the terrain just wont allow.

My guess is its a leaky arse house and a bunch of the moisture is coming from below in the crawl space. Dehumidifier might work but also may be an expensive way to treat the problem and not the cure.

I can tell you that this house had insulation in the crawl space, under the hardwood subfloor, and it has come detached in many places...probably hurting airflow.

It's being suggested that the old insulation is ripped out and replaced with spray foam insulation.

We have a huge crawl space and did a vapor barrier and it made a massive difference.

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replaced with spray foam insulation.

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this is another option I left out and effective if done correctly. Though even if done correctly, it creates a major risk of appliances leaking unknown for months and the water migrating outwards under the flooring/subfloor. This is because the closed cell foam effectively creates a water pan under the whole house. Small leaks are the worst since they can go undetected for a long time. But even someone spilling a mop bucket full of water and it seeping in under the base boards before it can be cleaned up can create issues.

Just a ticking time bomb imo but people do it and get away with it all the time with no problems.....some other people, not so lucky.

Vapor barrier/water management would be the lowest hanging fruit to try first.