Lots of critters where I live. I just discovered that they have chewed off the lineset insulation on the outdoor portion of my systems. The liquid line and the thermostat wire are taped to the vapor line which was insulated. I plan to install new insulation on the vapor line. I fear that they may chew the thermostat wire as well. What do you suggest as a guard for the insulation? Can I wrap it around the whole bundle including the liquid line?