This thread gives the a good opportunity to gripe about another bad RVP heat pump design detail: Operation of the optional auxiliary heat strip. The heat strip is triggered automatically in the 35 to 40 degree ballpark. When the temp goes below the switchover point, the heat strip runs instead of the heat pump. Like all heaters, when the heat strip is used after sitting idle for months, it smells for a few minutes. When I de-winterize I run the furnace with the windows open for as long as it takes to get rid of the smell. Can't do that with the aux heat strip, because the automatic design won't allow it (unless you're de-winterizing in near freezing weather). So when you hit the first cold day while camping and the aux heat comes on, it stinks like heck, and the only thing you want to do is shut it off. You want heat, not open windows to get rid of the smell, when it's freezing out. Because of this automatic-only operation, the aux heat strip is a mostly unusable feature. After getting hooked by it this spring I did add a switch to force the switchover manually, but what a pain to have to work around all these automatic things that should make life easier, not harder.