Interior of cabinets sweating.

My best guess would be lack of insulation in the wall allowing heat to build up inside the cabinets and the A/C cooling the house causing them to sweat.

How cold is inside your house, I.e., what is the air temperature inside the cabinets where it’s sweating? Sweating (condensation) would/could occur if the temperature of the cabinets is colder than the dew point temperature of outside air potentially infiltrating around/inside those cabinets from the exterior wall or attic. That’s the “why”.

I’m looking at outdoor temperature/humidity/dew point sensor underneath my porch (Baton Rouge) as I type this and the dew point temperature of the outside air is 77 F right now.

You need to check for outside air infiltration around those cabinets.

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That's a big job in itself to remove the cabinets and then insulate the walls, only to put the cabinets back.

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That kind of depends on what the exterior of the house is clad in. If wooden weatherboards or Hardie board, then he can have a contractor come in, remove one of the planks near the top of the wall and shoot insulation in the cavity to insulate it.

I'm sure they'd have ways to not be too invasive if a brick exterior, but I'm not familiar with that process.

Then again, if the cabinets don't go all the way to the ceiling, they could access the void to fill with insulation from that area by drilling holes in the sheetrock and then patching them and painting the area to match.

My last choice would be to remove the cabinets and sheetrock behind them to insulate and then new rock and re-install the cabinets.

Several things to consider.

1) Could be poor sealing of penetrations in the wall/cabinet allowing moisture from the wall cavity in (many trades rough in with a hatchet it seems). You can do whatever you want demo wise inside the cabinet, seal and insulate, and then trim it out with a panel inside the cabinet if you want to seal this up.

2) Any chance of a drain or plumbing leak adding excessive moisture in this closed space?

3) Consider undercutting the cabinet doors or using shims/stops to make the doors stay open a 1/16" or so to allow more conditioned air to temper the space in the cabinets.

Hope this helps.

Before you installed the new insulation, was there a moisture barrier in this wall to keep the outside moisture from getting into the house?