For us it's vents closed (they also have vent covers installed and when not in use have the vent pillows in them), filters kept clean, cold air returns proped open with pvc pipe, supply vents have every other fin removed, windows that aren't opened and the outside walls of all cabinets have silver bubble wrap installed, slide toppers and we use the awnings when possible. On our 2013 we've added extra awnings and close off the return air under the stairs in the summer. On our 2017 we have a third AC.
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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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