I'll be purchasing a new A/C split system. The furnace is horizontal in the attic and is 14.5" wide. The new evap coil case is 17.5" wide. My guess is that you'd want a transition adapter from the furnace to the coil. But space may be an issue.
What if the installer wants to attach the coil case directly to the furnace and just cap the overhang. Is that an acceptable way of doing things? The A-coil opening is around 9".
Thanks for any opinions.