I don’t know if this is beyond the scope of a “tip” but I will pass on some valuable advice given to me by a sparky/refrigeration friend doing some work at my home. We have a reverse cycle ducted system with usual ceiling vents and return. He said to force the return air to floor level before it enters the return grille. In our case the return grille is in the bedroom hallway so we installed a vent in the bottom of the hallway door and close the door when the heating is on. Wow does it make a difference.
I used a multi sensor datalogger to see air temperature profiles when heating. With the door open it
appears air is heated in a distinct layer from ceiling to about 100mm below the top of the doorway and just keeps cycling and increasing the differential between cold air below and warm/hot air above. With the door closed it forces the differential layer close to the floor and makes the living area feel warmer faster.