Time to change the furnace filter

[Snagglefoot]

That time of year. I change it once a year.

 

[AZjeff]

Every month here.

 

[hrv]

I change every 90 days with a MERV 4 or less....much easier on the motor and the airflow...

 

[Fitter30]

Doesn't look to dirty. Old filter is a better filter that the new one. If count the pleats showing 12 vr's 9 more suface area.

 

[Malo83]

Monthly here, filter is located in the hallway, with carpet, dogs, cats and high volume traffic.

 

[dishdude]

Thanks for the reminder, I need to do mine.

@Snagglefoot - where are you getting those 4" filters?

 

[JohnnyG]

Given that this is a 4" filter, I'd just quit smoking or burning firewood.

 

[97prizm]

I use nothing but 3M Filtrete 1900 furnace filters. 20x25x1. They flow better than the 1500 filters. Filters are cheap, furnaces and duct cleaning is not.

 

[97prizm]

My last furnace lasted 21 years. This way.

 

[Snagglefoot]

Thanks for the reminder, I need to do mine.

@Snagglefoot - where are you getting those 4" filters?

On Amazon. The original box is built for them.

 

[Pelican]

My furnace tells me when, it has an algorithm that calculates the hours of service and then sends a reminder on my thermostat.
I then check it and if I find that it's not dirty I don't change it.

 

[hrv]

Monthly here, filter is located in the hallway, with carpet, dogs, cats and high volume traffic.
View attachment 73945

 

[hrv]

I use one just like yours...I get them at Lowes.. They are a low MERV rating around a 5... Good air flow and still filter good too....

 

[samven]

I change 2x a year, when I change from heat to cooling and then when I go back to heat. I would love to change more often but my air handler is in the crawl space and I have to crawl 20 ft to get to it. My knees dont like that and I dont like the spiders.

 

[Warstud]

Why is this in the Mechanical/Maintenance Forum ?

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[mightymousetech]

MERV 11, every month.

 

[hrv]

My last furnace lasted 21 years. This way.

Mine lasted 20 years with a merv 5 or less....It was a Goodman gas furnace and HVAC

 

[AZjeff]

My furnace tells me when, it has an algorithm that calculates the hours of service and then sends a reminder on my thermostat.
I then check it and if I find that it's not dirty I don't change it.

Kinda like the OLM in cars but in reverse.

 

[JustinH]

I'm a big fan of Nordic Pure for odd wide filters like our new house has. 4 inch filters in a variety of MERV's for 20 bucks or so. $50+ anywhere else.

I change mine every 90 days but they are never very dirty. Probably doing it too often..

 

[duck__dodgers]

Project Farm had a youtube video testing the various filter brands...

for anyone interested.