Tip on Drain Lines
https://remingtontdcb407.westhavenscope.com/posts/comfort-experts-on-ac-repair-in-north-fort-worth-when-your-system-runs-but-does-not-cool-4
Tip on Drain Lines Tip for anyone with an attic air handler: check the secondary drain pan a couple of times each summer. Ours had standing water I never would have spotted otherwise