Heat Pump Wire

[WillowTails]

I am remodeling a 2013 Flagstaff Classic Super Lite, model 8528Ikws and I am upgrading the AC from a Coleman Mach 3 13,500 BTU model number 48253C969 to a Mach 15 HP2 model number 48004-869. I was planning on installing myself until I realized my rig does not have a white wire for my heat pump to my thermostat. Wondering how difficult it would be to run the wire?? Anyone done it before? I got a quote of $325 to run the wire and install the AC. Does that sound like a fair price??

Thanks....Willow