It sounds to me like we have too much leakage?

Yes but in Notes the areas of concern are specified. It suggests sloppy work if the installer thought they were done and this is the result.

Probably just sloppy work, although we don't even have our AC unit in yet so they'd have to be coming back at some point anyway.

the leakage sites are marked. so ask ac installers when can they come by to reduce excessive leakage. then schedule testers about a half-hour later.

they need to work as a team to resolve your concerns.

that said, there is an issue with the duct leakage report:

Target: 109cfm @ 25pa ---- 4.0cfm per 100sqft

Actual Results: 240cfm @ 25pa ---- 1.9cfm per 100sqft

if the target is 109 cfm (cubic feet per minute)@25 pa (pascals)

and actual leakage is 240cfm @25 pa

then the 4.0 cfm per 100sqft would be actual leakage

& the 1.9 cfm would be target.

4.0 cfm is more than 1.9 cfm.

call testing service to clarify.

I think they've transposed the 100 sq ft amounts.

I'd have hvac company MASTIC seal all duct takeoffs, plenums to

equipment equipment, and each supply box where it penetrates into

the living space.

not duct tape, not caulk, mastic or mastic tape only.

once sealing is completed & dry, re-test. I test when hvac

co is on site so that they can feel the leakage they missed.

best of luck.

If an HVAC installer brought duct tape to a job I would laugh at him. :P

As such, I call it duck tape. Because it aint for ducts. Why they call it duct tape I will never understand.

As energy rater notes, mastic or foil tape is the only way to solve your leaky problem. Mastic is better for take offs, foil tape is great for joining ductwork or flat surfaces of plenums.