There are a number of threads on this if you look in the search. I added a Dometic, a heat pump would have been too tall for where mine went. I got a non ducted one since the rig already is at minimum on supply vents. I unwired the control that only allows two to run at a time and put a breaker on the basement wall for a new 20amp run and took the supply out the wall of the rig near the convienence center and mounted a 30amp plug there. I either use a 30amp cord to my 30amp outlet on the box or, when we have visitors using the 30amp I run an extension cord to another non-GFI outlet I have in another location. If your rig was preped for a third AC the wiring is all there. The thermostat wire is behind the control for the fan when you remove it. Finding the controler that only allows two to run at a time is more of a challenge. Mine was in a return air vent next to the door.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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