I have used my x10 system with lights and outlets through out the house for a couple of years without any issues. I installed a cr 234 x10 amplified coupler repeater and life was good. However, a month ago I had a new Carrier air conditioning and heat system installed and nothing has worked since. Sometimes some of the lights come on, sometimes they dont or only a few will come on. Also, if any one has any thoughts on Insteon? My X10 system currently is the ir543 with the pronto. I am thinking of upgrading, but don't know if this would fix my problems.