Technical Bulletin | ARCXIS

Why 30% of HVAC Systems Fail Before Drywall Goes Up

Written by Admin | 05-128-2026

Most HVAC systems don’t fail on paper: they fail in the field.

Even the most precise design can be compromised during installation. That’s why HVAC rough-in inspections are so valuable.

We see it every day:
• Cut or crushed ducts
• Disconnected runs hidden behind walls, in chases or in floors
• Overturned ducts restricting airflow
• Install changes that have nothing to do with the original design

In fact, 20–30% of rough-in inspections uncover issues like these.

And the impact isn’t minor. We’ve removed drywall only to find twisted or disconnected ducts. We’ve identified improperly sized systems contributing to comfort issues, and even mold, because they weren’t designed for the home’s actual conditions.

At Arcxis, we don’t just inspect. We help prevent the problem: We can review third-party Manual JDS calculations with the same rigor we apply to our own designs, ensuring accuracy and consistency We can provide a consistent HVAC design so builders can compare “apples to apples” across bids We can work directly with installers in the field and provide hands-on training when needed

Because once drywall goes up, the cost to fix these issues can be 5x the cost of getting it right upfront.

For builders, it comes down to a few key questions:
• What oversight do you have during HVAC installation?
• How are you ensuring consistency across contractors?
• When issues arise, are you addressing symptoms or root causes?

The earlier you catch problems, the better your outcomes for cost, performance, and homeowner satisfaction.

Let’s get it right from the start. Contact your local Arcxis expert today: https://arcxis.com/markets