hot water bottles can be a life saver too, i live in a crappy british flat that gets to hot in the summer and to cold in the winter, the government over here arn't very helpful either and the city i'm from is basically poverty stricken (mildly) i mean, it's not 3rd world country stuff... but it's also not good either, it's a real crappy ghetto like place i mean, i'm no pro but at off the grid stuff but i found if you take a bunch of hot water bottles, stuff them all in a pillow case and just leave them all piled up in there under the covers with you, those things can stay warm for up to eight hours, it's a life saver for when you need heat that dosen't require electricity