Airflow
Having HVAC airflow problems? If your airflow is coming out weak,
not at all, or your air conditioning is blowing warm air instead of cold, it might be time to book an assessment - there's probably an underlying problem.
The volume of air emitted diminishes over time due to a buildup of debris on the underside of the coil. Out tests have found an average of 25% less air flow in units older than 20 years.
FREQUENTLY
Asked questions
Why is air not coming out of my vents?
A lack of airflow is usually due to one of the following:
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Thermostat settings: Ensure it’s set to heat/cool and the temperature is calling for operation
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Seasonal changeover: Your building may not be in the correct heating/cooling mode
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Power issue: The unit may be switched off or tripped at the breaker
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Dirty filter: A clogged filter can restrict or stop airflow
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Mechanical issue: The fan or internal components may require service
Next step: Check the above. If the issue persists, contact your building management or service provider.
How do I increase the airflow in my system?
If airflow feels low, try the following:
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Adjust fan speed: Set your thermostat fan to a higher setting (if available)
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Check and replace the filter: A dirty filter is the most common cause of reduced airflow
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Ensure vents are open and unblocked: Move any furniture or obstructions away from supply vents
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Confirm unit is running properly: Make sure it’s powered on and calling for heating or cooling
If airflow is still weak, contact your building management or service provider, as the unit may require maintenance.
Will we have better airflow with new unit?
Replacing and aging unit should help. Specifically, the following upgrades make a difference:
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A new coil will not have any build up or debris in between the fins allowing for freer airflow.
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The new variable speed blower is more efficient than the older single speed models, which helps to generate better flow.
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Better filter design. The newer filter helps with the consistancy of the return air draw, which can help with airflow.
Bottom line: A new unit can improve airflow if the existing one is underperforming, but it’s not guaranteed.
Why is my HVAC unit so loud?
Fan coil units can become noisy for several common reasons:
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Fan or motor issues: Worn bearings, loose components, or an aging fan can create rattling or humming
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Debris or dirt: Dust, insulation fragments, or other debris inside the unit can amplify sound
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Airflow restrictions: Closed or partially blocked vents and filters can cause the fan to work harder, increasing noise
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Deteriorating insulation: If the insulation of the unit is compromised, the sound of the unit will become amplified.
What to do: If the noise is new, unusually loud, or disruptive, contact your building management or maintenance provider to inspect the unit.
Can I change the filters myself?
Yes! Most fan coil units are designed for easy filter replacement:
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Locate the filter: Usually behind a front panel or grille on your unit
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Remove and replace: Slide out the old filter and insert a new one of the correct size
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Check regularly: Replace every 3–6 months, or sooner if it looks dirty
Tip: Always turn off the unit or set the thermostat to “off” before changing the filter. If you’re unsure about the filter type or installation, your building management or service provider can help.
