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3 answers

It really depends on where you live. How much Smog is in your area? How much Dust?

I would suggest you ask one of your local heating and AC guys. They would have some useful advice for your area.

2006-10-14 04:43:28 · answer #1 · answered by Paul S 4 · 0 0

set the timer to 250 or 500 hr and check the filter....is it dirty?
if it aint dirty dont change it

2006-10-14 12:52:05 · answer #2 · answered by hillbilly named Possum 5 · 0 0

once every 6 months or so should be plenty

2006-10-14 12:40:35 · answer #3 · answered by big jack 5 · 0 0

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