Anyone ever boil water over a fire in a paper cup?
NOTHING happens to the paper cup!
Nothing will happen to the evaporator coil either. There is refrigerant in there that absorbs the heat from the coil parts (just like the water (which is a refrigerant by the way)).
A/C air too cold for the furnace heat exchanger?
What temperature air passes through the heater in the winter? Almost the same as in the summer with the A/C on!