SolvedCommercial HVAC
Does this rooftop unit quote look high for Brisbane?
Asked by Avery Bennettin Brisbane, Queensland· 4/1/2026· 91 views
I'm in Brisbane, Queensland and dealing with a 12-year-old rooftop unit in our single-family 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 A$420 for repair, while another jumped straight to a A$12,479 replacement because of the age. The weather here has been dealing us sudden shoulder-season temperature swings, 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
We used the directory reviews to filter out firms that were vague about what they had actually tested. That saved us a lot of time. We had a related issue with our rooftop unit in Brisbane. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Lucas Murphy·4/1/2026
27
0
The recommendation should be tied to measurements, not just the age of the equipment. Age matters, but it is not a diagnosis on its own. 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 Brisbane, Queensland, 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 Brisbane, Queensland, 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 Brisbane. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
James Brooks·4/2/2026
13
0
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 Brisbane, Queensland, pricing can move around, but the diagnostic process should still be clear.
11
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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 Brisbane, Queensland, pricing can move around, but the diagnostic process should still be clear.
9
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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 Brisbane, Queensland, pricing can move around, but the diagnostic process should still be clear.
7
0
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 Brisbane. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Ava Kelly·4/2/2026
3
0
We used the directory reviews to filter out firms that were vague about what they had actually tested. That saved us a lot of time. We had a related issue with our rooftop unit in Brisbane. Once we forced every quote into the same format, the decision got much easier because the weak recommendations stood out immediately.
Michelle Patel·4/1/2026