Get the thermal package. It is only about $400 more. I had a Jayco Jayflight 19RD with the themal package. We camped in Wyoming down to about 10 degrees. Furnace heat goes down into that compartment. The black water valve is enclosed in heated area. On the 19 RD the grey valve was just outside of heated area. When camping at 10 degrees I would pour just enough anti freeze in to cover valves. I liked my Jayco. Their warrant is terrible. Once I took care of all problems myself it was a good TT. Dealer will brag how it is 2 year warranty etc. They could offer 20 years for what it was worth. Would I ever buy another Jayco? Yes but I would have to have at least 30% off since unless you are real close to the dealer you will pay inspection fee first. I paid for all my warranty issues. Cost me approx $500 for all my warranty issues. I'm not sorry I bought it since I paid $14k new with every option they offered in 2012. I only traded because we wanted a larger RV & retired. JMHO