You are probably aware that you have to take care of your HVAC system over time to make sure that it works as efficiently as possible. Unfortunately, many homeowners tend to forget how often to change HVAC filters, which can lead to many issues. It might also mean that you end up spending more money on repairs than you had expected.

You might have questions about your HVAC air filter, including whether you are changing it often enough. Here, we examine how often you should be changing your HVAC filters.

General Rules

The general rule regarding your HVAC air filter is to change it every 30 days. This is ideal if you are using more inexpensive fiberglass filters, but there are other situations where a high-end HVAC air filter could last for as long as six months. If you are using pleated HVAC air filters and furnace filters, then it’s okay to change them every 90 days.

Either way, homeowners should be checking the filters regularly. There may have been a particular season where your HVAC filter picked up more pollen, dust, and dirt, and homeowners should pay attention to it in order to know how often change HVAC filter.


It’s one thing if you are live alone and are thinking about your HVAC air filter. If you have pets and/or children, you should be more wary when it comes to air quality. After all, no one wants to wake up and find that their dirty HVAC air filter has led to your family or pets having allergies or getting sick.

Odor can build up over time, and cats and dogs can undoubtedly contribute to odors in the home. There might also be shedding seasons that affect how often change HVAC filter, and it might be a good idea to switch out your HVAC air filter every two months instead of every three months.

Thinking About Lifespan

There’s also a lot of other variables when it comes to the lifespan of your HVAC air filter. If you live in a spacious home, then it’s likely that your HVAC air filter will be under more pressure than someone’s air filter in a studio apartment.

It also depends on how much you use your heating and cooling systems. If you are blasting the A/C all day, then you can expect your HVAC air filter to have less of a lifespan than someone who barely uses it.


It will help to change your furnace filter and your HVAC air filter consistently. As you get in the habit of routinely changing your filters, you will start to recognize just how dirty they are, and you may decide to change them more frequently than you originally planned. It might also be worth it to invest in a better HVAC air filter if you don’t have as much time to switch them out.

One of the most important things to consider is whether anyone in your home has allergies or asthma. If this is the case, you may even want to change your HVAC air filter as frequently as every six weeks to ensure the best indoor air quality. For more advice, you can reach out to your local experts at Triad Mechanical at our website or call us at 770-415-5738.