Do You Know when You Changed The AC or Furnace Filter?

I use a quality filter made to last 3 months and change it at exactly every 3 months. The life of your A/C unit depends on using a clean filter. A dirty filter uses more electrical energy and causes the unit to work harder.

I am old and forgetful. When I change the filter I put a small piece of masking write the date on it and stick some place inconspicuous on the unit so I know when it as done.

Yes.

change mine once a month from dec to feb the change it in mar and not again til 1st of june the jul aug sept then oct 1st and again in dec 1st

When used 24/7 at least every month. Clean filters keep electric bills down. Just like clean air filters in your car help gas economy.

Yes, I know. How can that possibly be useful to you?

I changed them monthly at my old house, which was quite dusty.

I know - cuz I write the last date changed on it. Then replace it every 3 months. Sometimes - like when the heat or AC haven't run all that much - it's a bit premature . . . . . . but easier to remember and filters are cheap insurance.

Ours are changed when they look dirty.

Automatically do this when the time changes....in the Spring and then in the Fall.

Every season change

The chopped off boners of the elderly

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At least annually, if not sooner. Best to change it out each year right before the cold weather hits.