Just read the link I posted that comes from the experts. You live in an area where it is now mid 60's. Right now we have a feels like temp of 107 and an actual of 94. To maintain 70 degrees inside I do not want to suck in 90+ degree outside temps and 80+% humidity.
As it says on the link, about the DOUBLE hose units:
Won't cool effectively if outside temperature is higher than indoors, or if there is high humidity (recommended to remove second hose in such conditions).
Now this is the comment I really like about a double hose unit:
Can cool room faster, especially if outdoor temperature is lower than indoor temperature.
If the OUTSIDE temp is cooler, I really don't need an AC unit do I?
We travel and live in high temps and high humidity, and we also travel in zero temps out West and up North. We do not have a fixed detached garage to cool and heat, just our RV which moves to the extremes.