instalation

hey peeps just wondering as i have a friend wanting to start as he just recieved his license. He was wondering if he should put instalation in his walls of his room he is building...i said no and wanted a differant opion!! Thanks again

I know i would if i were building a room, double on an outside wall. Temperature control is important, and that will help significantly i think. Someone else will chime in im sure..... Good luck!!