How often does it need to be changed?
793115
It depends on your specific situation. You should check it at least every six months for excess dirt. Have a professional do it if you are not capable of checking it yourself. Mine lasts about a year with light use in a small house.
793116
I would say it depends on the conditions at your home. We live up in the mountains where it is very dusty, so we check it at least once a month. We'll change it based on the amount of dust on the filter paper. We can generally go a couple of months before having to change it out.
793117
The heating & air conditioning system I have recommends every 6 months. I know if you don't change them when the filter is dirty it will shorten the life of some components, particularly the fan motor due to the additional load caused by restricted air flow through the filter.
793118
Me personally it is 4 to 6 months depending on how much the furnace or a/c runs and this winter it ran a lot. It's a good filter and I bought another one already.
1114583
We just replaced our first one after 4 months. Will probably replace it every 3 to 4 months from now on.
1039773
You can change it as many times as you want. Just don't lose the little metal insert that comes with it. That is what you use to change to combination.
2160525
That is correct. Just remember, you will have to change them out about every 6 months.
1369816
I change mine about once every 2 months but I use distilled water if you have tap watermight need to change once a month.
810553
From previous experience I had to change mine every 12 months. The nice feature about these units is that you can change the batterywithout taking the unit down from the ceiling. The little pop open door on the face makes changing batteries a snap !
985495
I think they recommend once a month. It depends on how frequently you use it.
2123068
Yes, you'll need to change it every month or so. The meter indicator will tell you when to change it. Very easy to change & filters are not expensive
1330432
Their literature says that the batteries and the sensor should be changed once per year. I have owned these instruments about 25 years and have found that every 2 years is just about right. I google, ( and now Amazon ) look at price and then buy
1463460
There's not one answer to this question. It depends on the environment you live in and possibly the allergy sensitivities of people in the home. It's good to check them every month or so. We live inside a hardwood forest and it seems to me, we have to change ours about every 3 months or so. You can tell when they need changing, just by looking at them. If your environment has a lot of dust or other particles in it, you may need to change it every month. On the other hand, you might be able to go six months without changing it. Hope that helps some.
1925473
Dont know, I just started using mine a few weeks ago. Have not yet had to change it out.
1336192
One at a time. We change it about every 6 months. Your mileage will vary of course.
2043182
The best practice is to change it every 8 to 12 months. Even flowing strongly after that time filter could have lost part of its filtering properties.
282069
We change it about every 2 months, we have small dogs so it doesn't need to be done ant oftener.
363199
I change mine every 6 months but it depends on the hardness of your water. The filter can not be serviced. I usually recycle it with my plastics.
918425
The control screen will tell you when it needs to be changed.... frequency will depend on usage and environment.
1027490
The manual says to change the batteries at least once a year as a good safety measure, or at the same time as you change your clocks for daylight saving time. The alarm has a simple way to test it, and the manual recommends doing so once a week.