I am putting in a 2 ton Goodman split system heat pump and I would like to use hard duct in my attic. 1100 sf, 9ft ceilings,R-30 walls, R-40 ceiling, second story remodel. (Raleigh NC) An HVAC tech who is helping me is trying to talk me into using Flex. Hard duct just seems to be a higher quality to me. My attic will have foam insulation in the rafters, so it should be a conditioned space. His concern is during the summer, heat will still build up in the attic and cause condensation. If I have to insulate the hard duct I will just go ahead and use flex. Also, should I adjust the size of the unit because of the extra volume in the attic?