Diagnostics & Building Performance
When the same HVAC problem keeps returning, the failed part may not be the whole problem.
Marx Commercial Air helps commercial properties investigate persistent HVAC and building performance problems by looking beyond individual components. We evaluate the conditions affecting the system, gather relevant measurements and help our partners understand what is actually driving the problem.
Measure. Diagnose. Verify.
Designed for recurring comfort, humidity, airflow, pressure, controls and system performance concerns.
Complex HVAC Problems
Persistent problems usually require a wider view.
A recurring HVAC complaint can be caused by more than one condition. Equipment capacity, airflow, controls, outside air, building pressure, occupancy, operating schedules and system interaction can all affect the final result.
Recurring Equipment Failure
Components continue to fail without a clear explanation of why.
Airflow and Pressure Problems
Spaces feel stuffy, doors are difficult to operate, odors migrate or ventilation appears unbalanced.
Humidity and Moisture Problems
The building feels damp, surfaces sweat, condensation appears or humidity remains high despite active cooling.
Controls and Operational Conflicts
Equipment is being commanded incorrectly, staging is inconsistent or the system is operating differently than intended.
Uneven Temperatures and Poor Comfort
Some areas remain too warm, too cold or inconsistent even though the equipment appears to be operating.
Systems that Do Not Perform as Designed
The equipment runs but airflow, capacity, temperature or overall building performance does not match expectations.
The Marx Diagnostic Process
We don't guess when we can measure.
The goal of a diagnostic assessment is to move from symptoms and assumptions to evidence. The exact testing depends on the property and problem, but the process follows a consistent structure.
1. Understand the Problem
Review the complaint, service history, operating conditions, previous repair attempts and what the partner needs the system to accomplish.
3. Connect the Conditions
Look for relationships between equipment operation, airflow, controls, ventilation, pressure, occupancy and other building conditions.
2. Gather Evidence
Take the measurements, observations and system information needed to evaluate the problem properly.
4. Recommend and Verify
Explain the root cause, recommend the appropriate next step and verify the result when corrective work is completed.
What a Diagnostic Assessment May Include
The testing required depends on the problem. A diagnostic assessment may include some or all of the following.
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Duct system airflow and pressures
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Total external static pressure
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Room to room pressure
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Building pressure
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System temperatures
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Outside air conditions
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Relative humidity and dewpoint measurements
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Refrigerant pressures and temperatures
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Electrical component measurements
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VFD operations and commands
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BAS or controls operations and sequences
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Damper operations and outside air control
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Fan speeds and performance
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Equipment conditions including coils
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Equipment staging
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Sensor accuracy
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Exhaust and makeup air interaction
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Test and balance data
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Equipment sequence of operation
Not every assessment requires every test. The scope should be based on the problem.
Common Problems That Require More Than a Standard Service Call
Humidity Problems
High indoor humidity can be influenced by ventilation, pressure, airflow, controls, equipment capacity, runtime and outside air conditions, not just refrigeration performance.
Persistent Hot or Cold Areas
Temperature problems can result from airflow distribution, duct design, occupancy, heat gain, controls or equipment performance.
Outside air damper found left manually open causing indoor humidity problems.
Negative or Positive Building Pressure
Incorrect pressure relationships can affect comfort, odors, moisture, door operation and outside air infiltration.
Repeated Component Failures
A failed motor, compressor or control may be the result of a larger operating condition rather than an isolated defect.
Compressor oil sample detecting acid content
Testing and Verification When Measurements Matter
When airflow, pressure or distribution is part of the problem, Marx Commercial Air can use test-and-balance methods to better understand system performance. These measurements can help confirm whether equipment and air distribution are operating as intended and provide a baseline before or after corrective work.
services
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Airflow measurement
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Supply and return air balancing
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Room pressure testing
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Building pressure evaluation
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Fan performance verification
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System airflow verification
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Post-repair performance checks
A Diagnostic Assessment Should Create Clarity
The goal is not more data. It is enough reliable information to make a better decision.
Partners receive
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Clear description of the reported problem
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Relevant measurements and observations
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Identification of likely contributing conditions
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Photographs where useful
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Explanation of what the evidence indicates
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Identification of information still needed
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Recommended corrective actions
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Repair-versus-replacement considerations
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Suggested additional testing when appropriate
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Verification results after corrective work
A Diagnostic Assessment May Be Appropriate When...
The same problem has returned after multiple repairs.
Several contractors have offered different explanations.
The building has ongoing humidity or comfort complaints.
Equipment appears to operate normally, but the space does not.
Airflow or pressure is suspected.
Outside air, exhaust or makeup air may be affecting the building.
Controls or staging appear inconsistent.
A large repair or replacement decision needs better supporting information.
The property wants independent verification before moving forward.
Diagnostics Is Not Guesswork- and It Is Not Free Troubleshooting
Complex HVAC problems often require time, testing and analysis. A diagnostic assessment may be a paid professional service depending on the property, equipment and scope. The purpose is to gather enough reliable information to support a technically sound recommendation—not to produce a quick answer without the evidence required to support it.
Do you provide diagnostic assessments separately from repairs? Yes. A diagnostic assessment can be performed as a standalone professional service. Corrective work can then be proposed separately when appropriate.
Can you diagnose a problem even if another contractor has already worked on the system? Yes. Previous service history can be useful, but Marx Commercial Air will evaluate the available evidence independently.
Do you perform test and balance? Yes, when airflow and system-performance testing are appropriate to the problem or project scope.
Do you work with building automation and controls? Yes. Controls, sensors, VFDs, operating schedules and sequence of operation may be evaluated when they are relevant to system performance.
Can you provide a second opinion before equipment replacement? Yes. When a property is considering a major repair or replacement, a diagnostic review can help determine whether the recommendation is supported by the available evidence.
What is your service area? Marx Commercial Air primarily serves Palm Beach County, Martin County and North Broward.
Discuss a Persistent HVAC Problem
Tell us what is happening, what has already been attempted and what outcome you are trying to achieve. We will review the information and contact you to determine the appropriate next step.