We've used our 2017, 26BH (with "Arctic Package") in temps that got to the mid to lower twenties at night. We didn't encounter any freezing of plumbing, and it was easy to maintain comfortable temperatures in the trailer.
I wouldn't want to go any colder with it though, as moisture management becomes an issue. We do what we can to reduce moisture by venting, but condensation is a problem. The windows are all single pane, and become heavily condensated.
Anywhere cushions and other items come in contact with outside walls, we get moisture. If spare towels and clothes stored in the cabinets above the queen bed come in contact with the outside wall, there's moisture. Ditto for any pillows or cushions that come in contact with the outside walls.
Because of the poor insulation, and the single pane windows, we've found the practical limit of sustained camping to be somewhere in the twenties.
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