🔄 Replacing Rooftop Units: What to Know Before Going Like-for-Like

Short answer: Yes, you can replace a rooftop unit with another of the same tonnage—
but there are some important questions to ask before making that decision.

A like-for-like rooftop unit replacement seems simple on the surface, but failing to evaluate the full picture can lead to performance issues, missed opportunities, or even repeat failures. Let’s walk through what you should be thinking about before quoting or installing the replacement.

✅ Key Factors to Consider When Replacing an RTU

1. Start with a Simple Question: Why Am I Replacing This Unit?

• What failed with the old unit?

• Was it a lack of maintenance, poor design, improper sizing, or premature wear?

• Could this be a symptom of a larger building issue—like poor airflow, insufficient ventilation, or load imbalances?

Understanding the why can open the door to long-term solutions rather than just a short-term fix. Don’t just replace the box—solve the problem.

2. Talk to the End User

• Ask if the system kept the space comfortable throughout the year.

• Would they want it to work differently? (Better cooling? Quieter operation? More control?)

• Would they benefit from zoning or smarter controls like Pelican Wireless?

These conversations make the customer feel heard and may also open up opportunities for added value and better system performance.

3. Verify Equipment Specs

• Provide a clear photo of the data tag with your quote request.

• Confirm both cooling tonnage and heating input BTUs—especially important for rooftop units that serve mixed-use spaces.

• Even if cooling capacity matches, heating needs may have changed or been under/oversized originally.

4. Assess the Ductwork and Static Pressure

• Airflow is still king.

• Many newer RTUs feature ECM motors, which are more sensitive to static pressure.

• Confirm the correct blower motor duty (standard, medium, or high static).

  • If unknown, medium or high static is often the safer choice.

• Oversight here is a major cause of early motor failure and poor system performance.

5. Check the Curb Fit

• Rooftop unit curb misalignment is a frequent source of installation headaches.

• Confirm whether the existing curb will work or if an adapter is needed.

• Missing this step can derail install day—especially with crane coordination involved.

🧠 Final Thought:

Replacing an RTU with the same tonnage may check the box, but asking the right questions ensures long-term success. Understand why the old unit failed, check airflow and curb specs, and talk to the customer about what they really need.

We’re here to help with curb fitment, blower selection, and value-add solutions—just send in the details.