I just had a Carrier 110k 58CTA installed and am questioning the installers choice of attached products. I'm generally not one to pick apart someones work, but something here just doesn't look right. The furnace is mounted on its side - like the antique Ducane they hauled out to the yard. The new slab coil mated to the furnace is a Carrier CE3 5-ton - which matches the existing condenser. The return main duct is perhaps 1.5x the area of the furnace opening. Not a big difference. The area of the new coil is huge compared to the two. They had to fabricate angled ducts on both sides of the coil to funnel the air. In addition, the furnace and return duct are lined up, but the coil between them is off-center such that the the air would seem to blow mostly through a lower corner of the coil. Thinking back to my fluid-dynamics class in school, I imagine ineffective eddies and vortices in the off-center portions of the coil and funnel ducts. But hey - I am no HVAC tech. Am I concerned over nothing or do I have an issue?