New homes can be amazingly more energy efficient than older homes. Better windows, better insulation, more efficient heating and cooling, zoned heating and air conditioning, radiant-heat-barrier type attic decking, and improved air infiltration for starters. These features are also effective in resisting the formation of black mold.
We get light into dark rooms with solar tubes instead of skylights. The 12″ diameter mirrored tube efficiently tunnels sunlight into an interior room with very little heat gain. The clear domes on the roof of the pictured solar tube was able to withstand a hail storm.
Ambassador generally installs batted insulation its ceilings with 6″ R19 bats before sheetrock. After completion it overlays a minimum of R19, often R38 or more, layer of blown Fiberglas insulation for a combined R38 or R57 or more. This method combines the stability of the batted insulation with the ability of the blown insulation to fill all the voids between the bats.
Solar-board decking acts as a radiant heat barrier to reduce the attic temperature. A foil veneer is added to normal roof decking and the decking is installed with the foil facing the attic. The temperature difference is noticeable during summer constriction prior to the sheetrock phase.