help troubleshooting my 8th gen Honda Accord EX-L AC?

Hi!

So, I have an 8th gen (2009) EX-L V6 / Navi.... which just crossed 160K miles and I'd love to keep for a while longer before moving on. It's mostly in great shape, and the engine and transmission seem as good as the day I bought it.

That said, the AC stopped working at the end of last summer. Given that it was.... well, the end of summer, I said "next year's problem" and well here we are with it being next year.

Symptoms: It doesn't blow cold air. Ever.
Things I've checked and tried:

- All fuses and relays are good

- The compressor kicks on when I turn the AC on

- The pressure (on the low side) is at 50PSI

- The HVAC self-diagnostic test returned no errors

- The cabin filter is fine

- Fans blow tons of air (just... not the cold kind).

- No ODBCII codes (I use a BlueDriver)

Any suggestions for next steps before taking it into a mechanic? I'd REALLY rather not if I don't have to. :) I am mostly competent around the car, have decent tools, and am not scared to dive in. Any help would be super appreciated!