Can You Run Your Furnace Without A Filter?

A furnace filter doesn’t just purify your air, it keeps the inner mechanisms of your HVAC system functioning properly. That’s why you can’t run a furnace without a filter, because it can be bad for your health and indoor air quality. Moreover, you need to keep a clean filter in your furnace to ensure the unit operate efficiently and can keep dirt, dander, and debris from circulating back through your home.

A furnace filter is critical to keep your indoor air quality fresh and maximize the lifespan of your furnace. These filters are easy to change, making this a quick and no pain home maintenance task that drastically improves furnace airflow.

The Importance of a Furnace Filter

The air in your home is first sucked into the furnace through a blower fan. Next, air passes through the air filter before it’s heated and come back into your home. The filter consists of tightly woven fiberglass, paper, or cloth elements. This creates a semipermeable blockade that traps harmful particles.

A clogged air filter prevents air from flowing through the system which can lead to:

  • Cold indoor temperatures even with the heat turned on
  • Poor airflow
  • Expensive utility bills
  • Worn-down HVAC system
  • Overheated furnace

These things also happen the same as in an air purifier. Using an air purifier is the easiest way to remove the burden from your furnace. Before the spring to come, you need to know the best air purifier for allergies.

Why you need an air purifier, you can learn more from this article: Do air purifiers work for allergies.

Can You Run Your Furnace Without A Filter?

If you run a furnace without a filter for one night, it won’t affect your HVAC system immediately. However, the longer you run your heating system without an air filter, the more contaminants accumulate inside your heating unit.

The two main reasons youcan’t run a furnace without a filter are that your furnace could break down suddenly and that air will be filled with contaminants that are unsafe to breathe in. If your heater goes out in the middle of winter due to a clogged air filter, you will risk losing more money to fix the heater.

Related post: Can a dirty filter stop a furnace from working?

Risk of Running Your Furnace Without a Filter

The purpose of a furnace air filter is to keep your HVAC system in healthy condition, especially the blower motor and evaporator coils. If you choose to run the furnace without a filter, several potential problems can arise and lead to the breakdown of your heating system.

Poor Air Quality

The most prevalent issue that stems from running a furnace without a filter is poor indoor air quality. Dust is stirred in a home when the furnace continually cycles the air. Debris is sucked back up through the intake, pumped back through the air vents, and remains suspended in the air until it is inhaled or accumulates within the HVAC unit.

Contaminated Ductwork

Without a filter, pollutants and air toxins will travel throughout the ductwork. The debris will accumulate inside the ductwork, becoming trapped by the ribbed aluminum tubes. This accumulation will harbor moisture within the ductwork, creating the ideal conditions for mold to grow. Mold spores will begin to circulate throughout your home whenever the HVAC system is running and be extremely dangerous to occupants within the household.

Related post: How to Fix Hole in Air Duct.

How often should you replace a furnace air filter?

Check your HVAC filter once a month to ensure it’s not clogged, especially during the heavy-use winter months. Whenever the filter appears dirty, it’s important to replace it. At a minimum, change the filter every three months to improve heating efficiency.

A dirty filter will restrict airflow, make your heating system work harder, and increase your utility bill. How often to replace furnace filter depends on the size of the home. A clean filter will also prevent dust and dirt from building up in the system which can lead to expensive maintenance and your system breaking down prematurely. If your furnace is not blowing hot air, it’s important to check the air filter.

Related post: How to Proper Clean the Air Duct?