Review Very very poor workmanship in installation - watch out !!!

I had an system 4 unit install 3 years ago, now the aircon trunking condense a lot of water.
I start using other aircon servicing company and when they start explaining then I realise it was because of very very poor workmanship in the installation.
What was causing the condensation was - 2 copper pipes run within one thermal insulation, insulation is not the standard 3/8 inches, thermal insulation was pretty thin. Between wall peneration the copper pipe was bare with any thermal insulation. Now have to get all piping replace..