[MikeVillages]

Furnace/AC filter change interval?
Your info/comments and questions?

INFO:
Filter size: 16x25x4
Filter MERV: 10, what the previous owner used.
Square feet: 2000.
No pets:
Occasionally open windows for fresh air.
We usually keep the AC temperature @ 79 as we find that comfortable. The furnace temperature is set much lower.
We usually change around 6 months but think we could go longer.

[Kenswing]

Interview? Do you mean interval?

We use MERV-11 filters. Didn’t even knew they made a 10. Our HVAC company recommends every six months. I usually go a little longer since it’s just two of us and we don’t have any pets.

[Ecuadog]

Filtrete 16x25x1, MERV 13... change every 3 months... probably overkill.

[villagetinker]

We have the approximately 20 by 20, by 4 inch and the recommended interval was 6 months and this has worked well even with a couple of cats.

[vintageogauge]

We had our HVAC system on a maintenance schedule with Munns every 6 months and the tech always told us the condition of the filter which was good for about 9 months. We bought our filters at ace as it was an odd size and they seem to have everything in there. I might mention that the maintenance is a good thing to have, they caught a few items over the years that needed attention and none of it was at an extra cost.

[ThirdOfFive]

Six months; same interval as the water filter on the fridge and the air purifier in our bedroom. Amazon carries all three and about a week before change time I just order all three of them.

Amazon is about 20-25% less across the board on each filter.

[biker1]

You didn't indicate whether the depth was 1" or 4". If 4" depth, once a year is fine unless you have some extraordinary situation. For 1" depth, every 3 months is fine.

Originally Posted by MikeVillages

Furnace/AC filter change interval?
Your info/comments and questions?

INFO:
Filter size: 16x25
Filter MERV: 10, what the previous owner used.
Square feet: 2000.
No pets:
Occasionally open windows for fresh air.
We usually keep the AC temperature @ 79 as we find that comfortable. The furnace temperature is set much lower.
We usually change around 6 months but think we could go longer.

[CarlR33]

Assume you’re living there full time so I would just check it at 3 and then six months changing more/less often based on usage, etc. It’s not likely to do any impact to the system unless you get to a year or more

[MrFlorida]

Every 6 months

[Topspinmo]

When even you think it’s dirty enough cause your situation probably different? Mine according 4” filter last year or more unless weather unusually dry. But, I have angel hair filters on the intake which catches the big stuff, I change that every 4 to 6 months. And no it don’t affect air flow cause I measured before and after at ducts outlets. My ducts flow 350 to 580 CFM.

[MikeVillages]

Originally Posted by biker1

You didn't indicate whether the depth was 1" or 4". If 4" depth, once a year is fine unless you have some extraordinary situation. For 1" depth, every 3 months is fine.

I have 16x25x4 and updated my post. Thanks

[RICH1]

once a year with a 4 inch thick filter...

[Rustyboy]

I buy my filters off Amazon, Munn's changes it when they do the 6 months maintenance.

[retiredguy123]

I use a 16 x 20 x 4 MERV 11 filter and change it every 6 months. I buy them from Filterbuy on Amazon. I have found that the MERV 11 filters make the house quieter and less dusty than the standard MERV 8. They don't seem to limit air flow.

[Bness]

Originally Posted by MikeVillages

Furnace/AC filter change interval?
Your info/comments and questions?

INFO:
Filter size: 16x25x4
Filter MERV: 10, what the previous owner used.
Square feet: 2000.
No pets:
Occasionally open windows for fresh air.
We usually keep the AC temperature @ 79 as we find that comfortable. The furnace temperature is set much lower.
We usually change around 6 months but think we could go longer.

More pleated filters have more surface area. I would recommend 20 plus pleates at Merv 11 to 13. If you run your system normally with no pets and no smoking, you should get a year. Check the first of every month after 6 months and see what it looks like.
Also buy by the box. 4 inch filters come 6 to a box and the case cost is much cheaper. They don't go bad if kept dry.