My question is whether the the manufacturer stated SEER rating for a given AC/furnace/coil combo can actually be achieved when uncased coils are used?
Intuitively it seems that the rating would be lower unless the size of the hot air plenum is matched exactly to the physical coil size so that all the air flows throught the coil.
Yet everyone I have contacted states they use uncased coils.
Anything I should look out for when the install happens?
Specifics. Carrier 58MVP080-14, 38?DB036, CC5 style coil, TXV