5 Indications Your Furnace Needs Repairs - Alpine Heating and Air Conditioning

How Long Should a Furnace Filter Last?

The condition of your air filters greatly impacts your indoor air quality. If you fail to pay significant attention to the filters, the air in your home will suffer as a result, causing allergies, skin conditions, and breathing problems, just to name a few. Contacting our professional furnace services provider in Austin, TX, is recommended to inspect the condition of your furnace and filters if necessary.

The Frequency At Which You Should Replace The Filters

The frequency at which you need to replace the air filter depends primarily on the type and size of the furnace. Some air filters require proper washing, and you can use the filters again. However, our HVAC professionals advise homeowners to replace the filters every 3 to 6 months. If the filter is as thick as 6 inches, you don’t need to replace it for at least nine months. Below is a list of filters that last according to the size:

  • If the filter is at least 2 inches thick, it will last 1 to 3 months.
  • If the filter is at least 4 inches thick, it will last 6 to 9 months.
  • If the filter is at least 6 inches thick, it will serve you for up to 12 months.

You shouldn’t install a filter that is not compatible with your home. Rely on our service provider to choose the perfect filter type and size during the furnace installation in Austin, TX.

Types Of Filters

The type of filters for your furnace ensures how long it will last with the system. After you have selected the furnace type, allow our furnace service technician in Austin, TX, to decide which filter would be efficient with your system and home. Different types of filters are:

  • HEPA Filter: HEPA, also known as high-efficiency particulate air, is the most efficient filter in eliminating air particles that are as small as .03 microns. The efficiency rate is nearly 99.97%. However, these filters are expensive and can last a long time.
  • Fiberglass Air Filter: Made of layers of glass, this filter is the cheapest type. Even though these filters will keep the HVAC systems safe from dirt and debris, the filtration capability is relatively low. The fiberglass filter doesn’t last long.
  • Pleated Air Filters: These filters are better than fiberglass ones. You will find cotton or polyester material in the mesh to catch smaller air particles. However, one of the downsides of having this filter is it reduces the airflow. The reduced airflow, in turn, affects the whole furnace system. That is why you can’t keep the filters for a long time.

These three are the most common filter types available today per homeowners’ usage. The filters’ longevity depends on the furnace’s condition, weather conditions, people present in the house, etc. 


The earlier you take action to clean or replace the filters, the more comfortable you will be in your room. Your utmost care will improve the condition and lifespan of the filters. Contact us for a reliable furnace replacement service in Austin, TX, to help you.

Alpine Heating and Air provides exceptional furnace service that will leave you satisfied and happy. Contact us at (512) 759-4247 today.