I have A/C units that look like the one in the following page:
http://www.achrnews.com/articles/125995-johnson-controls-mini-split-ac-unitsheat-pumpsNow, one of the unit needs to be replaced. Is it necessary to replace also the copper pipes (I assume they are for freon)? The pipes are inside concrete wall. So, if they need to be replaced, that'll be a problem.