Quote Originally Posted by Rtic View Post
That (very) small run is going to do very little damage to the efficiency of the system; 8 metres, on the other hand, is going to have a big effect on the efficiency of the system. For any installer to install a system and insulate both lines together shows a complete lack of knowledge of how the system actually works... I'm guessing the installer of that 8m pipe run system is a plumber.
Can you quantify what the big effect is? I sense there is a lot of assuming and nothing to back it up.

The suction pipe will be returning very close to zero. The phase change line will be at a similar state. What transfer is actually happening and which way is it going.