How Often Do I Really Need to Change My Furnace Filter?

Person replacing HVAC air filter.
Table of Contents

How to Tell When Your Furnace Filter Needs Changing?

Your furnace has a filter, and it requires changing periodically. You may not have a clear understanding of how often you need to change this filter. This guide will help you so you know more about your furnace filter and when you should change it to ensure that the furnace is working properly and that your family is safe from allergens and contaminants.

If you have a filter that is 1-2 inches, change this filter every three months. If you have a four-inch filter, change it around every six months or so. Five-inch filters should be changed at least once per year. This will ensure that the furnace is working optimally and that the air is clean. A dirty furnace filter is inefficient and you may end up wasting money on your utility bills, and also need to opt for emergency furnace repair that would be less with a clean and efficient filter.

Factors that Affect to Change the Furnace Filter?

If you’re not changing the filter, then your furnace won’t work optimally. It may even wear out at a faster rate as it must work harder without a functioning filter. You’ll simply recycle contaminants back into the home, and the air will never be clean. This can impact your quality of life and health. It makes sense to change this filter as often as necessary to ensure that the home is contaminant free. You could be left with expensive repair bills if you don’t change the filter as the furnace could break down eventually.

Do You Use Heater Fan Frequently?

If you’re using your heater fan every day, then you’ll probably need a monthly change. Most people don’t do this, but if this is you, you’ll need changes often. If you often open windows and doors in the home, you’ll also need frequent changes as more contaminants will make their way into the home.

Does Someone in Your Home Have Asthma and/or Allergies?

If you have someone in the home that has any sort of allergy, you may want to change the filter often. You want to do this so that the air in the home is as fresh as possible. This will cut down the discomfort for that allergic member of your home. The filter cuts down on dust, dander, debris, and other allergens that people are sensitive to. You may also need to change it if you have some sort of medical condition that impacts your breathing. Talk to your physician about these issues to determine if the filter should be changed more often than normal.

Do You Have Pets?

Those that have pets will want to ensure that they have a clear filter. Pet dander and hair can get into the air and clog the filter over time. Animals will also track dirt from outside, which will clog your filter.

Replace Furnace Filter

Do You Have Young Children?

If you have young children or a baby, they are as susceptible to airborne contaminants as you are. Change the filters often if you have children in the home.

Do You Smoke?

If you smoke or have a family member that smokes, the filter needs to be changed more often than normal. With one smoker change a 1-2 inch filter once every two months, 4-inch filter every four months, and the 5-inch filter every six months. If there’s more than one smoker, then they need to be changed more often.

Is Your Home Dusty?

If you have a lot of dust in your home, then this reduces the lifespan of your air filter. Change the smaller filter once every month and the larger ones once every two months.

RECOMMENDED READING
» Furnace Repair: A Complete Guide on Furnace Problems & Repair

When to Change the Filter?

  • The filter has visible dirt. As this builds up the furnace loses a lot of its efficiency. You should change the filter if you notice a lot of dirt on it.
  • Your heating or cooling system seems to be coming on more often than it normally does. This could be a sign that the furnace filter is getting old and needs to be changed.
  • You notice that there is more dust than normal in your home. If this happens, check the filter and replace it if there’s a lot of dirt on it.
  • If you notice odd smells in the home or you smell something “burnt.” This indicates that the filter has lost efficiency and that it should be replaced. The furnace must work hard when there’s a poor filter

Replace the Air Filter and Increase the Furnace Lifespan

  • The size of your home can be a factor in how long the air filter lasts.
  • If you live in a polluted city with poor quality air, you’ll need more frequent air filter replacements. You don’t want the filter to work too hard, so replace it often if your city air is already poor.
Conclusion

By following this guide, you will have a furnace that is working optimally, and you’ll save money in the process. Ensure that your furnace filter is changed on a regular basis as it’s a simple way to keep your furnace in good condition and the air in your home clean.

Share This Post:

Your Satisfaction Is Our Promise

What HomeOwners Say About Us

Posted on Google Google
John Sefton profile picture
John Sefton
0 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9118XFernando from Conejo HVAC arrived at the appointed time and provided exceptional maintenance service for my ancient hvac system. He gave me some well considered long and short term recommendations for insuring safety and reliability for my system. Job well done.EOMASK373f8fc2ff9119X
Posted on Yelp Yelp
Karisa L. profile picture
Karisa L.
2 days ago
Yelp star 1Yelp star 2Yelp star 3Yelp star 4Yelp star 5Verified
EOMASK373f8fc2ff9120XMiguel came to look at a water pressure issue we've had for awhile. After asking a few questions he diagnosed the issue in less than 1 minute. He then clearly laid out the solutions and didn't pressure me at all to make a decision to choose them. He was extremely knowledgeable but not at all condescending. I really appreciated him and the prompt service and clear communication from the team all around! The guys who came the next day to install were also great!EOMASK373f8fc2ff9121X
Posted on Google Google
Wendy Winet profile picture
Wendy Winet
2 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9122XJuan G was fabulous . He explained everything to me showed me photos of what he was looking at and was very reassuring about my systems. Very pleasant need and clean. I would definitely recommend him and would love to have him come next time.EOMASK373f8fc2ff9123X
Posted on Google Google
Jeannette Burr profile picture
Jeannette Burr
2 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9124XMiguel was awesome! Fast, explained everything really well.EOMASK373f8fc2ff9125X
Posted on Google Google
Sharon Selinski profile picture
Sharon Selinski
2 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9126XHeater was 18+ years old and would not turn on. Over the Christmas holiday, Conejo Valley arrived two days after my call at the appointment time. After some discussion, we decided to replace the heater rather than repair. They then suggested the AC be replaced as it was 22+ years old. The 1969 ducts and insulation were replaced and upgraded to today's standard. The house is quieter and stays warmer these winter days. We're certain the AC will run less and keep the house cooler on hot days. Thank you Conejo Valley Heating & Air Conditioning for a job completed in 1-1/2 days with no aggravation or troubles on our part - just pure enjoyment with our new system! We recommend them whole-heartedly.EOMASK373f8fc2ff9127X
Posted on Google Google
Andy K profile picture
Andy K
3 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9128XDier Love was great! Very thorough and knows his stuff. He has very cool style. For any plumbing needs ask for Dier Love. You’ll love him. Andy KEOMASK373f8fc2ff9129X
Posted on Google Google
Julie Tauvaga profile picture
Julie Tauvaga
4 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9130XI didn’t use the services of any one at Conejo because they were very nice to tell me that my problem (gutter clean up on a manufactured home) was not something they did. They did tell me what I needed to find.EOMASK373f8fc2ff9131X
Posted on Google Google
Norm Nelson profile picture
Norm Nelson
4 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9132XShout out to Gabriel Kepner with Conejo Services. Came out on Friday to service our dual system thermostat that was not working properly. Installed a different one that worked better, but found a better option. Returned on Monday with the newer thermostat and set it up and works perfectly. Norm NelsonEOMASK373f8fc2ff9133X
Posted on Yelp Yelp
Pantelis C. profile picture
Pantelis C.
5 days ago
Yelp star 1Yelp star 2Yelp star 3Yelp star 4Yelp star 5Verified
EOMASK373f8fc2ff9134XBrandon, Andrei, & Christian did an amazing job! They were on time and completed the work in 3.5 hours (which was less time than their original estimate), and that included removing the previous "electrician's" work and performing the install up to code. They installed an interlock device in the panel to prevent a backfeed of power if the main power is restored whilst the generator is still running. They went above and beyond and I recommend them most highly.EOMASK373f8fc2ff9135X
Posted on Google Google
Musa Ra Men profile picture
Musa Ra Men
7 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9136XTimely and professional service.EOMASK373f8fc2ff9137X
Posted on Google Google
Janice Fenton profile picture
Janice Fenton
7 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9138XJuan G was so courteous and extremely thorough. Thank youEOMASK373f8fc2ff9139X
Posted on Google Google
Fran Hutton profile picture
Fran Hutton
9 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9140XMatthew was great to work with and did a great job giving me a new toiletEOMASK373f8fc2ff9141X
Posted on Google Google
Maria Victoria Silva Elipe profile picture
Maria Victoria Silva Elipe
9 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9142XJuan G was excellent, super helpful and very efficient doing the vent cleaning for my dryer. I am very pleased with his work and he is really a very nice person. I will use his company for further needs in my house. Thank you!EOMASK373f8fc2ff9143X
Posted on Google Google
Bob Crocco profile picture
Bob Crocco
9 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9144XJuan was on time, very efficient, and very pleasant. ThanksEOMASK373f8fc2ff9145X
Posted on Google Google
Avigail Vizconde profile picture
Avigail Vizconde
9 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9146XJuan I’m pleased with the work he did when he came over to look at my heater heating system and wash the dryer slime it’s very good thank you so muchEOMASK373f8fc2ff9147X
Posted on Yelp Yelp
J F. profile picture
J F.
10 days ago
Yelp star 1Yelp star 2Yelp star 3Yelp star 4Yelp star 5Verified
EOMASK373f8fc2ff9148XJust finished our biannual system checkup. Tech Craig McConnell always does the BEST job for us! Glad we found him decades ago and have stayed with him as opur HVAC guy since he moved to Conejo (then HVAC) a long time ago. We have had them here for other jobs, such as roofing, plumbing and electrical checks - always great service.EOMASK373f8fc2ff9149X
Posted on Yelp Yelp
Steve C. profile picture
Steve C.
11 days ago
Yelp star 1Yelp star 2Yelp star 3Yelp star 4Yelp star 5Verified
EOMASK373f8fc2ff9150XConejo Services just serviced our home. Miguel came out and did a great job. He is very thorough and took the time to explain the issues. He proposed good solutions and was very fair. Well done, Miguel!EOMASK373f8fc2ff9151X
Posted on Yelp Yelp
Allison C. profile picture
Allison C.
11 days ago
Yelp star 1Yelp star 2Yelp star 3Yelp star 4Yelp star 5Verified
EOMASK373f8fc2ff9152XWe had a leak at 5AM. I called the help line and got an appointment the same day. They sent out Miguel and he was able to complete the work efficiently and now I no longer have a leak.EOMASK373f8fc2ff9153X
Posted on Google Google
Michael Dembicer profile picture
Michael Dembicer
12 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9154XHVAC technician William Montoya provided us with exceptional service. He thoroughly assessed our entire HVAC system and made thoughtful short and longer term maintenance recommendations. I highly recommend William and look forward to working with him in the future.EOMASK373f8fc2ff9155X
Posted on Google Google
Daphne profile picture
Daphne
14 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
EOMASK373f8fc2ff9156XI do appreciate George. He did such an excellent job to my ring cameras and I am so grateful to have him help me. Thank you, George. You're the best.EOMASK373f8fc2ff9157X
Verified by Trustindex
Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more