Who do I have to hire to figure out why the humidity level is high my house?

Ac is cooling fine

Following on this, my 2 Ecobee jnits have been reading 75/78% all summer. I remember reading that having a larger hole in the wall can cause it to read high but I checked it against a couple of Accurite monitors and they are reading 70% or higher.

We have 2 AC units that are original to the house (mid 90’s) so I am sure they are part of the problem but I would like to put off total replacement for as long as possible because they seem to run fine (except for the humidity).

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Someone mentioned it should be around 60% in summer. What about rest of year? I just ordered a hygrometer to check mine.

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It can vary, but mine is usually around 50% throughout the year. It will obviously spike in very rainy conditions and persistently throughout the humid part of the summer. When it cools off and your a/c dont run as much, make sure you run the circulation fan at a regular interval.

This past month I have been in the low 60's some days. When it is raining for days on end it is hard to maintain less. Usually we are in the 50-60 range, dipping into the 40's from time to time.

So my nest is saying 83% humidity upstairs

2 bedrooms and jack and Jill bath maybe 1200 sf

2.5 or 3 ton unit runs at night and I set it to 76 during the day

I think I need to turn on a dehumidifier and run the ac more

Your ac is probably oversized for the wet and relatively cool August we've had. Perhaps leaving the blower on all day would help.

You could have leaky ductwork. If your duct is leaking into the attic a portion of the air is lost, therefore it creates a suction inside of the house that has to be drawn in from outside bringing high humidity hot air into your cooled space. It could also be sucking air out of the attic on the intake side but this is generally not the case since it’s only one duct and usually very short.

My ducts were all leaking and it caused mold around all of my registers and dust to build up around my light switches and outlets where air was being pulled in through the walls. I got my duct work replaced and not only did it stop the moisture and dust but my space was much more comfortable.

Check to see if the drain line is clogged. It can back up and the fan run but the compressor not come on. Can make the house feel muggy.

Check that the Fan is set to Automatic and not On.

Had this issue a couple of weeks ago because someone (most likely wife) changed the settings.

House has returned to typical humidity since changing settings back.

I know it sounds counterintuitive but, that was my experience.