history: I just had my air conditioning system cleaned out because it wasn't working right.  Wow, the junk that came out of it was awful.  The owner before me never used filters.   I just had my air conditioning system cleaned out because it wasn't working right. Wow_comma_ the junk that came out of it was awful. The owner before me never used filters.
current: Did you call him to complain about that?
next: No, since its my house and they missed it in inspection, there wasn't much I could talk to him about.  It was gross.  Dirt, dust, and gobs of pet hair.  I was breathing it the whole time!