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The good news is that there are fairly straightforward guidelines that you can follow to know when you have to have your filter replaced.
Under normal conditions when the fan is off you can expect to have a one to two-inch filter replaced every three months. For a four-inch filter, you should have it replaced every six months, and a five-inch filter should be replaced once a year.
If you keep the fan on your furnace on all year long, you will need to replace a one to two-inch filter every month. A four-inch filter every two months, and if you have a five-inch filter, it should be replaced every three months. If you only run the fan occasionally, you can wait two months for a one to two-inch filter, up to four months for a four-inch filter, and a five-inch filter should be replaced every six months.
If you keep your windows and doors open during warm weather or if your home gets dusty quickly, and you have your furnace fan on, you should replace a one to two-inch filter every month. Four-inch and five-inch filters should be replaced every two and three months respectively. If you only occasionally keep your windows and doors open, then you can use the replacement times listed above for keeping the fan on occasionally.
Having smokers in the house can also clog your furnace filter faster than a non-smoking home. If you have one smoker in the house, your filter should be changed every two months for a one to two-inch filter, every four months for a four-inch filter, and every six months for a five-inch filter. If there are multiple smokers in your home a one to two-inch filter should be replaced monthly, a four-inch filter should be replaced every two months, and a five-inch filter needs to be replaced every three months.
Just as in a house with multiple smokers, if you have animals in your house, especially if they are heavy shedders, you should replace a one to two-inch filter every month, a four-inch filter every two months, and a five-inch filter every three months.
As you can see, it is not too complicated to figure out how often you need to have your furnace filter replaced. These are just general guidelines, however. The conditions in your home may vary slightly from these scenarios, but if you have a professional come in to change your filter, they can give you a better idea of when it is best to have your filter changed.
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Kelly came to my home, took measurements, asked the right stuff and was so thorough in providing information and tips that I had absolutely no questions for him. Don and the other young man who came for the install were fantastic, they even swept up OUR mess from the floor! This team really made what could have been a nightmare turn out to be an easy and even pleasant experience. Thank you to the incredible team at Furnasman!
I was asked if I was happy with the Furnace Tune Up and Duct Cleaning. The technician was pleasant, polite, and thorough. And, he did not take a long time to do the Tune Up. I am pleased with the services provided by Furnasman. I am happy that I do not have to worry about my furnace and air conditioner.
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Very courteous right from initial call for service through the whole process. Technician explained all that he was doing and why the furnace wasn't functioning properly. Would highly recommend their service.