Hvac fliter cleanliness

[Bryan N.]

Has anyone figured out why after 3-4 months tenant a, b and c has HVAC filters that look 100 years old and completely clogged but tenant d’s filter looks brand new?  All have pets and no smell of smoke in the house. All have different levels of cleanliness.  Some units old and some are new. 

[Bryan N.]

I replace them myself.  Every time they say “I just changed that not too long ago”. It’s always a lie.  Plus.... you can use that opportunity to “check for leaks” and ensure the place isn’t getting trashed.