RTU's not cooling the building enough

[abcando]

As long as they're insulated well enough to withstand the extreme roof temps I don't see a problem with them.

It's a sloppy application of foam type insulation. He should take a split at the unit and then take a split at the entering and leaving ductwork inside the building and compare the numbers.

I wonder how much heat he's picking up through that ductwork ??

Maybe he needs to run a sprinkler set up for the duct work ?

The foam insulation was done just last year. Prior to that, the insulation was either bad or there was none. I had actually used the sprinkler on some exposed metal ducts .

The guys scraped the old one to the metal and sprayed the new one about 1" to 2" thick. I was hoping this could have done the trick until this heat wave happened.

I had taken splits at the units and inside but on different days. I'll try to do it again and compare.

[gwoner]

My money is on closed dampers,boxes, check the design specs for CFM.Sounds like someone needs some test and balance report to remedy this situation.