yeah! I read that for 2 story houses you sometimes want separate cooling areas. Whether that is a separate unit, bigger unit or compartmentalized cooling/heating zones. I don't know if that is something we need or should get but the AC tech should be able to give some insight. The previous owner of this house lived here for 2 years and I don't think they did anything in regards to servicing (and even cleaning) so the unit should be looked at regardless of this issue.
oooooh I misread
@Mather's first ask. Yes, I don't think you need insulation on the roof, but I was referencing the floor. From that potato picture I think there is insulation on the floor but it's not enough thickness I believe.