close to the window which usually has the highest heat loss | gain
& direct that air onto the window & wall
you will get good results if each bdrm has a return vent into the hall -- I put one out of my closet in 3 bdrm, one above the door in the fourth. since I did not want to have a large gap below my door.
BTW, the master bdrm is setup for Shelter- in- Place against hazardous vapors from a chemical spill, etc.
harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!