Unconditioned attic furnace and air conditioning
I have a 96% furnace with AC condenser in my unconditioned attic in Michigan. There is heat tape, insulation, and angle on condensate drain.
There are ample supply and return air ducts running into both supply and return plenums. Plenums are spray foamed. R-6 flex ducts look sealed pretty well. Drain pans with shut off sensors are installed.
Aside from the golden rule of not having a furnace in an unconditioned attic, are there any other concerns I should address heading into my first summer in this house using the AC?