I am going to build carriage house doors for a garage.  They will be painted.  The garage is located in phoenix, so the climate is very hot and dry.  They are east facing, so will get direct sun exposure during the morning.  I am unsure about what kind of wood to use.  Rot resistant softwoods, like ceder, redwood or even doug fir would be fine, given that it will be painted.  But I am concerned that these woods will warp and check in the heat/sun.  I’m also considering Red oak, since it is relatively inexpensive and will resist rot, but I’m not sure about overall stability in the sun.  Cost is a consideration.  Any thoughts for me?  Many thanks.