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Can Furnaces Run Without a Filter?

February 6th, 2020 by cverdone

Furnace Filters

We are all guilty of overlooking HVAC routine repairs, replacements, and maintenance: at least once in our lifetime. You realize that your furnace’s filter hasn’t been checked in ages, and when you finally do, it’s too damaged, and now you can’t install it back. So, can your heating unit run without a strainer? 

Technically, your furnace can run without a filter. However, you risk damaging your heating system and putting your health and that of your family at risk. Typically, when air gets sucked into the heating system through the blower fan, it passes through the strainer that sieves out the debris, dirt, allergens, and dust. The clean and purified air is then distributed to various rooms in the building. Although you can run your HVAC without a filter, HVAC professionals discourage it highly. The answer to this question, according to the experts, is a no. The results make running your furnace without a filter not worth it.

Reasons to avoid running your unit without a filter

Thanks to air filters, air quality has been made a reality. With a clogged air filter or an absent one, you could trigger the following issues:

  • Escalated energy bills from overworking the heating system.
  • Poor and inconsistent airflow.
  • Low temperatures.
  • Overheating furnace.
  • Wearing out of the system that results from an overworked fan.
  • Contaminated duct-work.
  • Health hazards from poor air quality.

What if you run your HVAC without a filter?

Accidents happen, and you will find yourself in between a rock and a hard place. If something happens in the middle of a cold winter night and you have to uninstall the air filter for a day or two, it’s probably not going to cause any immediate detrimental issues to your system. Nonetheless, replace the filter to avoid letting in the contaminants into your home or working space. Also, your furnace will collect a lot of dirt and contaminants in the absence of a filter demanding quick maintenance and repair services.

How often should you replace your air filter?

HVAC professionals recommend inspecting the condition of your filter every four weeks to ensure it’s clean. The more you use the system, the higher the frequency of replacement.

At the bottom line, even though your HVAC will function without an air filter, it is not operating in the appropriate way that the manufacturer designed it. If you suspect that your air filter needs a replacement or has developed other associated problems with the heating system, call Thornton Heating and Cooling immediately. We are experts at diagnosing and creating solutions for HVAC issues.