Luckily I live in an apartment so they purchase the new filters and bring them around to you and also replace them for you. Unfortunately, they are a little on the slackerish side. This past week my a/c stopped blowing cold air because the filter needed to be changed. I went out and bought one and today on my way back from lunch I see the maintenence man bring around air filters.....about a week and a half late, if I do say so myself!