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HVAC people say AC that works right will remove 5 gallons/hour from the air, so they think putting adding an alternate return up high for summer will work... we'll see.

I had a lot of noise outside and it was simply a hard plastic tube that wrapped around the wires that was rattling. Easy fix, wired it against the grate.
Sounds like your noise is more serious...

This last post of mine wasn't very clear, let me try again. I'm told 2.5ton unit is the smallest, so the best we could do was make it more inefficient by lowering the fan speed and sending some of...

We just spent $6500 on a new one for the main house, and not really clear what good that would do anyway. This unit is only 10 years old.
It's a portable unit, a big one and it works pretty good...

Yep. I know, it's too big.

It runs frequently enough, and we tried to make it less efficient by running two additional ducts/registers to the other parts of the house. It does not run ...

There are no duct in the slab, and I don't know if it is insulated (the addition was already here), but the hardwood floor has a thick plywood insert where rug covers it and it's dry.

We can't...

Oh, and we also lowered the fan speed. It's a 2.5 ton unit (I think I said that right).

A master bedroom/closet/bath addition (slab) has its own AC unit, and we are taking at least five gallons of water per 24 hours with a portable dehumidifier. No exaggeration.

We have reinsulated...