Quote Originally Posted by beenthere View Post
No they aren't. new line sets aren't made any thicker then line sets made 20 years ago.
The copper in the evap coil is thinner then what it was 20 years ago.
I think he may have meant larger diameter. Either way an existing line set may be just fine if cleaned properly. I like to change them if they are easily changed like others have stated but cleaning works if done properly.