What Is Static Pressure in HVAC?

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Why is static pressure vital in HVAC and what does it even mean? In this article, we will explain several aspects of what static pressure is and whether or not it can be an issue for your heating and cooling system.

HVAC stands for Heating, Ventilation, and Air Conditioning, and static pressure is an essential point of maintaining your HVAC system.  The definition of static pressure is as follows: the airflow resistance in ductwork or other components of an HVAC system. A high level of static pressure indicates an issue with the HVAC equipment. It is essential to diagnose this issue early on to take the appropriate steps to remove or repair a system with this condition.  It can allow HVAC to last longer and do a better job.

What Is Static Pressure in HVAC Systems?

A heating and cooling system is built to carry a specific amount of air, respective of the size of the unit. Additionally, Ductwork enables your system to work adequately and effectively. If all components of the system are installed efficiently, this pressure will be at the optimal level. These are the factors that keep your AC running and provide a comfortable temperature throughout hot months.

Some Symptoms of a Static Pressure Issue

Poorly designed systems and inadequate ductwork installation can contribute to high static pressure. Here are some of the issues you might encounter because of high static pressure in your HVAC system:


Restricted or irritated airflow makes for a noisy HVAC system. If the static pressure of your HVAC system continues to increase, so will the noise that your system will make.

Impaired airflow

Hot and cold spots in your home are often the symptoms of higher static pressure. When the static air pressure of your HVAC system continues to rise it may output an inappropriate amount of air per ton.

Equipment failure

Static pressure can lead to extensive heating repair services, like having a blower motor or compressor repaired. If you do not get these components fixed, it can result in a lack of any type of heating or cooling in your home.

What Causes High Static Pressure?

Your pleated filter

All HVAC systems have filters, but standard 1″ pleated filters produce a remarkable restriction on airflow. They are making an effort to filter a maximum of air across a small area. As your filter becomes thicker and thicker, then the resistance becomes higher and higher.  That is the reason we suggest utilizing a media filter with a lower pressure drop.

Poor ductwork design & installation

Restriction in the ductwork contributes to higher pressure. Sagging flex ducts and other installations can also be the causes behind high static pressure.

How you can Get Rid of High Static Pressure

If your system isn’t working well due to static pressure, you will most likely need an expert to look at your HVAC system to get an estimate on how much it will cost to repair the damage. If you start to notice any of the symptoms of static pressure mentioned above, it is probably a good idea to have your HVAC system inspected. At Coastal Home, we offer HVAC repair, installation, and maintenance. Contact us today to get a quote for your system repair!

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