We are talking with several contractors about converting a screened-in eleveated porch (decking floor) to a sunroom. The current roof is asphalt singles with no true insulation. We will be installing a PTAC for HVAC. We live in Opelika, AL (HOT). The room faces North and would be somewhat shaded in the summer months. One contractor insists that the ceiling should be dropped so that insulation can be installed. That seems to make sense. None of the other contractors even mentioned insulation above. Will we regret NOT insulating at the time of construction? Any thoughts would be greatly appreciated.