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When I went out a couple of weeks ago to check on the RV for our trip this week up to BC for a few days, I discovered that the refrigerator was kaput. So that's a project. So it turns out that RV refrigerators use some kind of an ammonia type solution or they use a boiler to literally boil that solution to cool the refrigerator. Now, how that works is some kind of physics magic that I don't quite yet understand, but you know, there's a lot of things I don't understand. So what I do know is that the refrigerator used AC power to run a heating element to heat this mixture when it wasn't running on propane. So it's either propane or heat or heat.