The thermal windows are a great addition, but, that heat pump, for the cost of the upgrade is AMAZING for late season camping.
We love ours - it's nice, dry heat, and it works with the quickness. Combined with the fireplace, and thermal windows in our 38FLSA, we have no "cooler weather" issues.
We used our Genset a few times this year, and it's nice to have also. We took the 5'er boondocking and stayed in a VERY remote location for almost 7 days on a single tank of water and 21 gals of fuel for the genset.
N-JOY and Good luck with the new camper!!!!
2015 Sierra Denali 3500HD SRW
2015 Jayco 38FLSA - Loaded -
B&W Companion 20K slider hitch