I am going to look at a persons house that was built in the 70's. It has low voltage light switching. From what I am told the relays are located in the attic. It seems that some relays will " stick" in the summer when the attic is very hot.( It's not the same relays every time either)There is never a problem during the winter /fall/spring. The homeowner doesn't want to rewire the switches either. Another Electrician suggested that I try and make sure the relays are located together and maybe install a stat controlled fan to blow across them to try and cool them. Maybe try locating them close to the gable vent with a fan blowing inward and another on the other end blowing out; cooling the attic at the same time. Have any of you ever dealt with this type of system? Any ideas / suggestions are welcome