The whisper quiet are heaven! You can actually have a normal conversation in the trailer while they are running - barely hear them except for a hum coming from the roof.
Ours are also heat pumps. I used to think the furnace was the quieter of the two when we had our older unit with the return air in the center of the roof, but now we prefer the heat pumps for heat when we can over the noisy ol furnace :)
Aussies - there is no way your split units are quester than these unless you are ducting the supply from a remote location. There is nothing quiet about a split unit.
