Top 10 Most Common Causes of Low HVAC Airflow

February 07, 2022Back to blog
Most Common Causes of Low HVAC Airflow

The most common HVAC problem is airflow inefficiency. Luckily, in many cases, this problem is easy and relatively inexpensive to fix. However, as with many other things in life, it’s better to prevent an issue from occurring in the first place. In the following article, we’ll help you do just that by listing 10 common issues that can lead to airflow obstructions even in the most modern HVAC systems. These are:

1. Blocked air vents and registers

Make sure all vents and registers are open and not blocked by furniture or equipment. This is a common issue in office settings. Pay special attention to vents located on the floor, as these can easily get covered by rugs or carpets.

2. Obstructed condensing unit

Grass, weed, branches and trees that grow particularly close to the outdoor AC unit might be infested with pests and insects. This can lead to damage, causing the system to function improperly and supply insufficient airflow. It could also lead to system breakdowns. Make sure the area surrounding your cooling system is cleaned on a regular basis.

3. Duct leaks and blockages

Air ducts are the airways of your HVAC system. Heated or cooled air passes through air ducts to the living areas of your home. If the airflow from your air ducts is low, it is probably caused by dust, dirt and debris buildup inside the ducts.

If this is the case, contact your local air duct cleaning service provider to clear these obstructions. By not giving attention to this, not only will your HVAC system have to work harder, but it will also draw more energy.

4. Dirty air filters

To prevent dust from getting into your home, the air ducts in your home are equipped with filters. If these filters get visibly dusty and dirty, it is necessary to replace them. Dust and dirt that accumulates in the filters prevents sufficient airflow into the system and into the house.

If there is not enough airflow, your HVAC unit will work much harder to produce the same amount of cooling or heating. This can cause overheating and ultimately a breakdown. Replace the air filters at least once a month or change them according to manufacturer’s instructions.

5. Dirty condenser coils

Low airflow can also be the result of having dirty cooling system coils. These condenser coils are responsible for releasing the heat from the cooling system. Since these units are located outdoors, they can get dirty over time. This results in an overworked unit, which can lead to damage and breakdown. Make sure to book a scheduled HVAC system cleaning and maintenance to prevent these problems.

6. Thermostats

HVAC problems aren’t always the cause of low airflow issues. There are times where they’re caused by something as simple as a faulty thermostat. It might just need a battery replacement. If the thermostat keeps having issues, you might need an upgrade. This is a great opportunity to look into the modern and highly advanced thermostats that will soon be available.

7. Outdated HVAC unit

The average useful life of an HVAC unit is about 15 years, depending on the frequency of usage. Aging HVAC units should be replaced, as they will not supply sufficient airflow in a consistent manner. Another negative effect is the cost of repeated repairs and maintenance.

8. Oversized HVAC unit

Bigger isn’t always better. If the HVAC system is too big, it can produce too much airflow, which can damage your ductwork. This will also mess with its sensors, causing it to turn on and off frequently, which will eventually cause damage and breakdown. Consult a professional technician for the appropriate size of HVAC unit for your home.

9. Minimal refrigerant levels

A cooling system with leaking refrigerant is another common cause of low airflow and less air cooling. If there are leaks in the unit, the system’s performance will decline. Have it checked by a HVAC technician to fix the leak.

10. Slow-moving blower fan

Blower fan installed in an HVAC system is responsible for moving the cooled or heated air from the unit through the duct to the living spaces of your home. Over time, dust and dirt will accumulate in the fan, causing it to slow down and resulting in low airflow. This is why regular HVAC system cleaning and maintenance is so important. If the blower fan is accessible, cleaning it is the solution, otherwise, a professional service will be required.

Where can I find a reliable HVAC duct cleaning service in Toronto

Where can I find a reliable HVAC duct cleaning service in Toronto?

If there’s significant dust buildup in your HVAC ducts that obstructs the airflow in your home, don’t hesitate to give Sem’s Duct Cleaning a call at (647) 476-2711. We’re a reputable company that specializes in providing the complete range of duct cleaning services in Toronto and beyond. Reach out to us today!

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