Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How often does this filter need replaced?
Document: Needed to replace the filter on my new AC after 1 year. The installers said they needed to be replaced annually, and warned that they would run about $100. So this fell right in line. I hadn't looked at the one that was in my system, but laughed as I took it out to see the brand was the same too. Good stuff. If you need a 16x25x5, this should be a winner for you.
The filter seems a tad pricey until you realize how thick it is, how long it lasts and what a good job it does filtering the air. If you historically bought the cheaper filters your replaced once a month they cost nominally $10 each and therefore $ 120 year. This filter should be good for year unless you have very dusty air (in which case you would have replaced the cheaper filters more often also). The supplier delivered the filter within a week, well packaged and exactly as advertised.
This air filter is exceptionally good. Lasts for an extended period so I don't have to change the filter as often.
I had the new system installed last fall for health reasons and although the service tech didn't think that it was necessary to change the filter yet, I replaced it to be sure.
Good price for an otherwise expensive filter. Fortunately, we only need 1 a year. The Merv 16 helps the allergy sufferers in our household sleep better.
The Merv 16 filter removes a lot of stuff from the air, and it's recommended for those of us who have allergies. These filters come in a 2-pack, and they're just what I need because I have 2 units in my home. The price is better that most prices offered online.
This filter is recommended to be changed only once a year but it lasts longer than that. When my AC man came to service the unit he said it still does not need to be changed and it has been 13 months. He said it had 6 more months to it. Expensive at first, but when you consider how long it last it is probably cheaper in the long run.
It's worth the money. You only need to change it once a year. It cost just a little more than $9 a month. I tried using the cheaper filters, but changing them every 3 months was a headache. Most of the time I would forget to change them. I replace this filter every January. It's worry free and does a great job.
I have hay fever in the spring and summer. In my last home I had a Carrier Infinity Air Purifier electrostatic filter on my HVAC. They are problematic to maintain. I moved house 18 months ago the HVAC has this filter installed. It has a MERV16 efficiency rating, the same as the electrostatic unit. I replaced the filter element and waited for spring and summer eye watering sneezing season to arrive. I run my HVAC circulating fan most of the time on low speed.
This is an outstanding filter, and it was delivered within days.
Answer: That depends on how dirty the air is in the home. Some people change the filter every 6-8 months, other people can go 8-12 months. At our house it depends on things like how dusty the outside air happens to be. When conditions are dry and windy there is more dust in the air. When we have construction going on inside there is more dust. I have changed ours anywhere from 6-9 months depending on the conditions.