2019 Keystone Pathfinder ??? Is that your tow vehicle or your trailer ???
The "winter season package" has been called everything under the sun by various RV manufacturers. Names like Polar Package, Arctic Package, Cold Weather Camping Package, Four Seasons Package, and too many others to mention....
One telling aspect of any "package" is that there are usually some association with "grandeur" that come with the name.... Most are "boastful and wishful thinking".... But, in your trailer, with the name "Extended Season Package" Keystone may be somewhat more realistic with the name...
Why is that ??? Any RV with 2" thick sidewalls, single pane windows, minimal insulation in the floor/ceiling, a 50 to 60 percent efficient furnace and a "2 inch heat duct to keep the belly tanks warm" is, at best, hopeful thinking for early spring/late fall camping in many places, but "ain't no winter package" going to keep most Keystone brand trailers warm in Montana, Idaho or Wyoming in January/February" without extensive additional preparation.....
Here's a photo of that "infamous 2 inch heat duct" intended to keep the belly from freezing. Its inability to do what they promise is what led directly to the addition of tank heat pads on the belly tanks in later models.