SolvedCommercial HVAC
Repair or replace a 18-year-old rooftop unit in Dallas?
Asked by Benjamin Pricein Dallas, Texas· 3/20/2026· 228 views
I'm in Dallas, Texas and dealing with a 18-year-old rooftop unit in our two-storey home. Over the past week, it has been cooling the space unevenly during occupied hours and we're now noticing the system sounds normal at startup but never quite settles into a steady cycle.
One contractor quoted $316 for repair, while another jumped straight to a $12,294 replacement because of the age. The weather here has been dealing us dry afternoon heat, so I do not want to wait too long, but I also do not want to approve the wrong scope.
If you were comparing bids on this, what would you want checked first? I especially want to know how much weight you would give to economizer settings, supply temperatures, occupancy schedules, and sensor calibration.
commercialrtucontrols
9 Answers
21
✓ Accepted Answer
The price range alone does not tell you enough. Ask what was tested, what failed, and which assumptions are built into the quote. For a rooftop unit that is cooling the space unevenly during occupied hours, the first things I would ask for are economizer settings, supply temperatures, occupancy schedules, and sensor calibration. If the contractor is recommending bigger work, ask them to explain which measurement supports that recommendation and whether they ruled out airflow or controls first. In Dallas, Texas, pricing can move around, but the diagnostic process should still be clear.
26
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If this landed on my schedule, I would want to document the core readings first and then explain exactly why the repair does or does not make economic sense. For a rooftop unit that is cooling the space unevenly during occupied hours, the first things I would ask for are economizer settings, supply temperatures, occupancy schedules, and sensor calibration. If the contractor is recommending bigger work, ask them to explain which measurement supports that recommendation and whether they ruled out airflow or controls first. In Dallas, Texas, pricing can move around, but the diagnostic process should still be clear.
20
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From a contractor side, I would not approve a major repair or replacement without test results that line up with the symptoms. For a rooftop unit that is cooling the space unevenly during occupied hours, the first things I would ask for are economizer settings, supply temperatures, occupancy schedules, and sensor calibration. If the contractor is recommending bigger work, ask them to explain which measurement supports that recommendation and whether they ruled out airflow or controls first. In Dallas, Texas, pricing can move around, but the diagnostic process should still be clear.
18
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If you can, ask whether they checked airflow before recommending equipment. We nearly replaced a system when the bigger issue was elsewhere. We had a related issue with our rooftop unit in Dallas. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Charlotte Bennett·3/21/2026
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What helped us most was breaking the quote into labour, parts, warranty, and optional upgrades. The expensive bid looked very different once it was itemized. We had a related issue with our rooftop unit in Dallas. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Olivia Patel·3/21/2026
13
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What helped us most was breaking the quote into labour, parts, warranty, and optional upgrades. The expensive bid looked very different once it was itemized. We had a related issue with our rooftop unit in Dallas. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Owen Foster·3/20/2026
13
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From a contractor side, I would not approve a major repair or replacement without test results that line up with the symptoms. For a rooftop unit that is cooling the space unevenly during occupied hours, the first things I would ask for are economizer settings, supply temperatures, occupancy schedules, and sensor calibration. If the contractor is recommending bigger work, ask them to explain which measurement supports that recommendation and whether they ruled out airflow or controls first. In Dallas, Texas, pricing can move around, but the diagnostic process should still be clear.
13
0
From a contractor side, I would not approve a major repair or replacement without test results that line up with the symptoms. For a rooftop unit that is cooling the space unevenly during occupied hours, the first things I would ask for are economizer settings, supply temperatures, occupancy schedules, and sensor calibration. If the contractor is recommending bigger work, ask them to explain which measurement supports that recommendation and whether they ruled out airflow or controls first. In Dallas, Texas, pricing can move around, but the diagnostic process should still be clear.
8
0
What helped us most was breaking the quote into labour, parts, warranty, and optional upgrades. The expensive bid looked very different once it was itemized. We had a related issue with our rooftop unit in Dallas. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Evelyn Murphy·3/21/2026