While unrelatedly digging through my (unfinished) attic, I realized that the HVAC return is open to all of that hot air. Basically the wall with the return register is actually open to the attic at the top.
I don't know enough about these systems to say if it's definitively a problem, but it seems suspicious as I think I'd be using the AC to cool off a bunch of hot attic air. It's a single-story home in the bay area and the HVAC system was replaced under two years ago.
Should I seal it off? If so, is something like OSB/plywood sufficient, or are there other considerations? The attic has insulation, but it's probably so old that it should be replaced with something more up to modern spec..
![[FO] 32M joining in too, holiday gift for my gf](/api/ImgurImages?id=xuQlALI.jpg)
