We've lived in this home for 3 years, the landlord didn't do anything before we moved in. We've replaced a few things but I'm tired of doing all the maintenance (small things that were missing when we moved in, replaced missing knobs on closets, weather stripping, screens etc..). He never reimburses. I checked the furnace filter yesterday and it looks like it hasn't been changed since the house was built ('07), I never thought to check, my mistake. I went looking for one and it's an odd size that isn't carried locally.

My question is who is responsible for furnace maintenance? How often do you check/replace the filter?