We have that (or a similar one) system but they are installed above the ceilings in the kitchen and bathroom.
Main unit is on the roof.
It's an inverter which takes in the outside air, cools or heats it, then vents the old air out.
A ducting system from the unit that's above the ceilings pushes the air into the living room, dining room and downstairs bedroom from the kitchen and the bathroom one pushes it into the two bedrooms upstairs.
Very, very quiet and only costs about 12 cents an hour as it powers down (but not off) when the temp you selected is reached and that's pretty quick. A great blessing when we had plus 40c temps last week and averaging 33c this week with the lowest night time temp being 26c.
Works just as well in the winter on heating mode plus includes a dehumidifier.
OK, cost 3,000 euro for the full installation but been very worth it over the years. Previous aircon units we had in a flat were so bloody noisy you couldn't sleep at night, especially with the constant switching on and off. And having to empty a 5 litre container of vented water 3 times a day.