12 pack furnace filters on sale

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Racer X wrote:
[quote=jdc]
12 filters would last me 4 years.

are you basing that on swapping them every 120 days like clockwork, or when they need it, and what is healthiest for the family, and most fuel efficient for your furnace/heat pump?

We have 2 cats and I have to clean my furnace filter monthly. And I'm off to do that now, BTW.
Wah? Our furnace is off from April until October.