My water lines will start freezing as warm as +12°F if the water isn't left dripping. There is a few problems with this: 1 They lied to us about global warming making cold snowy winters a thing of the past. 2 there are multiple things that could trigger a cold period. (Vulcanism, Beaufort gyre, grand solar minimum) 3 with off grid rain/well water it's really wasteful. 4 I have lived in Maine, even water lines ran along the external wall usually don't freeze until below 0°F (that's against code) I have just gotten a glimpse of the current setup. It's all 1/2 and 3/4 pex and it's laying on the ground under the house. The guy that installed it was too lazy to hang the piping. So sitting on the ground sucks all the heat out of the lines, then heat rises so being on the ground instead of clinging to the floor joists keeps the lines cold and keeps them away from the heat. The way I thawed them out last time was I rolled the electric dryer outside and ran the hot air discharge under the house. It took 3 hours of dryer discharge heat to thaw the ice out of the lines. I have a hot water recirculation pump for the hot water line, so it won't freeze after that's installed. But the cold water lines still could. I think I at least need to get the pex pipes up off the cold ground and up where the heat can get to them. Install plastic line safe heat trace wire and put insulation around the pipes, especially around the hot water. What else should I look at?