Eva888:

 

The room with the heat pump has high chapel ceilings. The heat pump sits up too high so by the time the heated air reaches the person sitting or the ends of the room, it’s cooling and breezy. Can’t put it any lower as no wall area. The room is warm except from knees to floor level. Floor area is cold. This is why I wondered if the bedrooms ducted could be extended to a low part of the living room by going in from outside. 

 

As for the bedroom vents, even closed they would leak enough warm air into the unused bedrooms, they aren’t airtight. I did it to push more air into another duct that was added into the corner of the living area by someone else, but that was pretty useless. Original installer was a crook who took advantage of our trust and left us out of pocket to boot.

The entire system needs an audit. 

 

sounds like it needs an audit alright.

have you got the lounge heatpump head height (measured to the top of it). they actually have an install height they are meant to be installed at and its not a figure that tends to be openly published. the other problem can be size of the room. big rooms can be a pain with heatpumps trying to get enough throw to get the air to circulate. that can cause cold air to sit at floor level. typical fix is to use a ceiling fan to mix the rooms air.

there is also height between the indoor and outdoor units. i don't know if your single story or not.

i assume existing ducted heat pump head is in the ceiling. 

ducting outside is a pain because you need to box and insulate the ducts. in ceiling or under houses is bad enough, but wind and rain makes it problematic so it needs to be covered. also the size of the ducts are a lot larger than the bedroom ones.