I'm getting ready to dig my 100' water line trench between my house and shop and am considering the different wiring that needs to be buried also. My HVAC man is telling me that he thinks that my long run of thermostat wires (approx. 130' total) will be too far to maintain voltage needed to throw my relays in the shop. I don't recall anyone here raising that as a concern. I could understand the problem if I was running 24DC, but I didn't think I'd have a problem with this being that the current is AC. Is this going to be a problem? My HVAC man is semi retired and probably won't be involved in my project, but I do respect his knowledge in this area.