Fall Tune Up Part 3:The Hidden Arrow Rule?

We'll go ahead and start the maintenance and we'll just start by getting a new filter in here and seeing how bad the old one is. These folks definitely need to change this one a little bit more often. I'll look in here and see if I see anything that catches my attention. Little dust is to be expected. Nothing crazy. I can't see all the way in there so sometimes I'll take my phone, make a little video, watch that video playback. I don't see anything alarming in here. It's a little dirty but nothing scary. This is an April air filter. I like these a lot because they fit the cabinet perfectly. Every filter has an air flow arrow on it and it doesn't matter if you're in an attic and the unit is laying on its side or if the unit is in a closet. The direction of the arrows is always towards the equipment and in this situation the filter is on the left so the arrow faces to the right.