How Often Should I Change My Furnace Filter?
Most homeowners know they need to change their air conditioner filter, but did you know you need to change your furnace filter as well? A dirty furnace filter not only decreases performance but can put unnecessary stress on your system, leading to breakdowns and damage.
So the question then becomes, “How often should I change my furnace filter?” Read on to learn the answer to that question and many more.
Next time you search for “fix heater near me,” give Cool By Design a call!
Air Conditioner Filter vs. Furnace Filter
First, though, let’s clear up a misconception. Many people talk about air conditioners and furnace filters like they are different, but this is inaccurate. If you have a central HVAC system, your furnace and air conditioner use the same filter. This filter is usually located between the main HVAC body and air return ducts.
How Often Should I Change My Furnace Filter?
Furnace filters remove particles from the air, and over time, those particles can restrict airflow. The resulting strain on your heating and cooling system can damage ductwork fans and motors, which can require expensive repairs.
We recommend you change your furnace filter at least once every six months — preferably once every three months. Homeowners who live in areas with a lot of dust, dirt, or air pollution may have to change their filters once every other month.
If you are not sure about changing schedules, check the manufacturer’s recommended replacement for your current filter. If you have a high-efficiency furnace with a HEPA filter, you may only need to change it once per year. Households with pets may need to change filters more frequently due to pet hair and dander.
Filter Thickness
The thickness of your filter can affect how often you need to change it. Generally speaking, thicker filters can go longer without changing. For example, a 1” or 2” filter should be changed once every 30 days to 90 days. In contrast, a 5” filter can usually last between nine and 12 months.
Furnace filter slots are designed for a particular thickness, so don’t try to cram in a filter that is too large. Using a filter that is too thick or too thin can negatively affect performance, so make sure the replacement filter is the right size.
Summer vs. Winter Filter Changes
Seasonal changes can also affect filter change frequency. All other things being equal, filters last longer during the fall and winter because there is less moisture that can capture dust particles. Conversely, you should be more diligent about changing your filters in the spring and summer due to air quality and air conditioner usage.
Signs You Should Change Your Furnace Filter
Below is a short list of some of the most common symptoms of a dirty furnace filter:
- Restricted airflow
- Inconsistent heating
- Furnace shutdowns
- Poor indoor air quality
- Air vents covered in dust
- Increased allergies and respiratory discomfort
- Increased heating bills
You can always visually inspect your furnace filter if you are not sure about its condition. If you can see any white pleats and the filter is dark gray or brown, you probably need to change it.
Furnace Filter FAQ
Below are answers to common questions we receive about furnace filters.
Aside from decreased performance, dirty filters can raise your energy bills and, in a worst-case scenario, might be a fire hazard.
Yes, you can change your furnace filter on your own. However, most HVAC companies will change your filter during a routine maintenance appointment.
Most furnace filters range between one and two inches thick. Using a filter that is too thick or thin reduces system effectiveness.
Most residential furnaces do not need a HEPA filter. HEPA filters are mostly for sterile environments, such as research labs or hospitals. HEPA filters are extremely dense, so they can severely restrict airflow.
Number-One Heating & Air Conditioning Services from Cool By Design
To recap, “How often should I change my furnace filter?” The answer is at least every six months. Furnace damage from a clogged filter can require expensive repairs, so don’t neglect changing your filter!
If you would like to schedule furnace maintenance or air conditioner maintenance, send us a message or give us a call at (954) 417-1580!
