A heat lamp would most likely work well, but since I’m off-grid I try to avoid any heat produced by electricity. With the short days I use up a lot of my batteries just maintaining the house.Would a heat lamp work too? We use them for our baby chicks out in the barn and they do fine regardless of how cold it gets outside.
I have a couple extra bottles from a travel trailer I sold. I hook the heater up to one of those and it should last awhile.I forgot that you where off the grid. Did you use a small propane bottle or is the heater tapped into a bigger tank?