I'm looking for a cheap split Air Conditioning unit for a new conservatory. Some of these units say "No Vacuum Pump required":
others dont mention it:
Whilst I generally understand that performance will be 'better' if the pipes are vacuum pumped, do they need to be, and if not will it degrade the life / performance of the system a great deal?
For clarity I am not talking about the B&Q style DIY install units here with the sealed pipe units, but units where the pipe is supplied effecticley open and flare joints are used.
Thanks in advance. Kevin