Love note or chore reminder?!

So we are down to 22 days till N gets home and 8 notes to find.  So N is giving my clues.  This time he said note #29 was regarding a chore N does (not me) and it would be found in a dark place.......I just found note #29 in the attic with the extra air filters!  No they had not been changed since N left 4 months ago.  :)  Needless to say, I went ahead and changed the filters and hung up note #29.  :)