I can't give you a number, but I can you tell I have camped in my 2012 29QBH WITHOUT the thermal package to mid-high 20*'s. One New Year's trip in particular was day times in the high 50*/low 60*, but once that sun set about 5:00pm it dropped to the 30s very quickly. We were on hookups so we kept the sinks running with a slight drip just to have movement in the lines. We burned a lot of propane, but we were comfortable and all systems kept running.
A camping neighbor, similar setup without thermal package, didn't run his water the way I did during his first night and his supply hose froze, but the internal plumbing was fine.
One thing to keep in mind, with the 2012 Thermal Package, the enclosed underbelly is heated with a single register being driven from the furnace. Therefore, you can't do the popular thing and run electric heaters to save propane and think you are heating the underbelly at all.
Our biggest issue was drafts coming from the front pass through storage up either side of the bed. Those pass through compartments on my JayFlight are not heated and the door provide nearly no insulation value. If you are going to camp in the cold, I would get some 2" foam and find a way to better insulate the pass through.
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2020 Ram 1500 5.7L
2007 Chevy Duramax LMM/Allison (Sold)
2012 Jay Flight 29QBH (Sold)
2012 Jay Flight 26BH (Sold)
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