How Better Planning Helps Contractors Deliver Smoother RTU Replacement Projects
Commercial rooftop HVAC retrofit projects rarely fail because of a single major issue.
More often, it’s a series of small oversights that create bigger problems once installation begins. A missing measurement, an overlooked airflow transition, or a last-minute equipment change can quickly turn a straightforward replacement into a costly delay.
At Curbco, we’ve partnered with contractors, distributors, engineers, and facility teams on thousands of retrofit projects. While every building is different, the challenges are often the same.
Here’s what we see most often and how you can avoid these common pitfalls.
Relax… It’s Curbco.
Why Retrofit Projects Become More Complex Than Expected
Unlike new construction, retrofit projects require new equipment to work within existing building conditions.
Every roof tells a different story.
Older curbs, undocumented modifications, structural limitations, and varying duct layouts all add complexity to the project. That’s why successful retrofits begin with careful planning rather than assumptions.
When your team understands the existing conditions before installation day, you’re far more likely to stay on schedule and avoid unexpected field work.
1. Inaccurate Field Measurements
Accurate measurements are the foundation of every successful retrofit.
Even small errors can lead to:
- Poor curb adapter fitment
- Airflow alignment issues
- Field fabrication
- Crane delays
- Change orders
Always verify critical dimensions before equipment is ordered.
📐 Need a refresher? Read our guide: What Information We Need to Design the Right Curb Adapter.
2. Assuming Every Roof Curb Can Be Reused
Existing roof curbs should always be evaluated before a replacement project begins.
Look for:
- Corrosion
- Water damage
- Structural deterioration
- Insulation issues
- Signs of previous modifications
Some curbs can be reused with a custom adapter. Others may require replacement to support the new equipment safely.
👉 Learn more about our Commercial Roof Curbs.
3. Overlooking Airflow Transitions
A replacement unit may physically fit while still creating airflow problems.
Review:
- Supply openings
- Return openings
- Duct alignment
- Transition sizing
- Economizer compatibility
Proper airflow planning improves system performance and reduces unnecessary field modifications.
4. Waiting Too Long to Review Equipment Submittals
Replacement units often differ from existing equipment in ways that aren’t immediately obvious.
Review manufacturer submittals as early as possible to identify changes in:
- Footprint
- Weight
- Airflow layout
- Utility connections
- Curb requirements
Early review gives your team more flexibility if adjustments are needed.
5. Underestimating Crane Logistics
Crane scheduling affects far more than installation day.
Coordinate early with:
- Building management
- Roofing contractors
- Equipment suppliers
- Delivery schedules
- Weather forecasts
Every hour a crane waits on-site impacts labor, scheduling, and project costs.
6. Missing Critical Project Documentation
Incomplete project information slows everything down.
Before requesting a quote, gather:
- Existing RTU model number
- Replacement unit model number
- Roof curb dimensions
- Rooftop photographs
- Equipment submittals
- Project drawings
The more complete the information, the more accurately your retrofit solution can be designed.
📁 Ready to get started? Submit Your Drawings.
7. Poor Communication Between Trades
RTU replacement projects often involve several teams working together.
Including:
- HVAC contractors
- Roofers
- Electricians
- Structural engineers
- Crane operators
- Equipment suppliers
Early coordination helps reduce scheduling conflicts and keeps projects moving.
8. Ignoring Production Lead Times
Equipment isn’t the only item with a lead time.
Remember to account for:
- Rooftop units
- Custom curb adapters
- Roof curbs
- Freight
- Crane availability
If your schedule is compressed, planning ahead becomes even more important.
⚡ Ask about FastPass for qualifying expedited production projects.
9. Choosing a One-Size-Fits-All Solution
No two retrofit projects are exactly alike.
Custom-designed solutions help minimize field modifications and improve installation efficiency.
At Curbco, every curb adapter is designed around your specific equipment and roof conditions, helping your team install with greater confidence.
👉 Explore our Custom Curb Adapters.
10. Waiting Until Installation Day to Solve Problems
The best retrofit projects solve problems before anyone steps onto the roof.
Review measurements.
Confirm equipment.
Coordinate schedules.
Verify drawings.
When planning happens early, installation becomes much more predictable.
How Curbco Helps Keep Projects Moving
Retrofit projects come with enough unknowns. Your manufacturing partner shouldn’t be one of them.
Our team works alongside contractors, distributors, engineers, and facility managers to help simplify every stage of the retrofit process.
From reviewing project information to designing custom curb adapters and supporting expedited production, we’re focused on helping you reduce surprises and keep installations on track.
Whether you’re replacing one rooftop unit or coordinating projects across multiple facilities, we’re here to help.
Relax… It’s Curbco.
Ready to Plan Your Next Retrofit?
Before requesting a quote, gather:
- Existing unit information
- Replacement equipment details
- Roof curb dimensions
- Airflow opening locations
- Rooftop photos
- Project drawings
Our team will review your information and recommend the right solution for your project.
Need your project moving sooner?
⚡ Learn more about FastPass.
Continue Learning
Keep building your retrofit knowledge with these additional resources:
