Insulated flexible ducting

We have been working all summer long with just two window units, one upstairs and one downstairs. That's how things were done a generation ago. We have the door open at the front of the house, and the windows open at the beach side of the house. A gentle (if warm) ocean breeze blows through.

While the flex ducting (pictured in both photos below) is now in, only one set of air handlers is communicating with one another. This means that we have cool air in the downstairs of the house, but the upstairs is not currently on. Our air conditioning experts continue to troubleshoot the problem.

The installation team had to get under the house to remove the old duct-work and replace it with this insulated flexible tubing. The internal air handler components sit upon this box.