The guideline is 3 months but it is entirely dependent on how often you run your furnace, and how dusty or pet-filled your environment is.
I used to manage buildings, so I would deal with hundreds of filters at a time, people with pets or those who ran the circulation function continually needed 3-month replacement. Other people who did not run the fan continuously and did not keep pets, and stayed clean, you could easily get away with a year.
You have to hold the filter up to the light to know, there’s no way to judge it based on time it’s just not useful
So I’m well overdue for a new filter lol. Still dealing with sprinter (spring winter)where I am and have a dog. Not gonna say how long it’s been since I switched it.
The guideline is 3 months but it is entirely dependent on how often you run your furnace, and how dusty or pet-filled your environment is.
I used to manage buildings, so I would deal with hundreds of filters at a time, people with pets or those who ran the circulation function continually needed 3-month replacement. Other people who did not run the fan continuously and did not keep pets, and stayed clean, you could easily get away with a year.
You have to hold the filter up to the light to know, there’s no way to judge it based on time it’s just not useful
So I’m well overdue for a new filter lol. Still dealing with sprinter (spring winter)where I am and have a dog. Not gonna say how long it’s been since I switched it.