If you are on a tight budget, electrical heat is NOT an option. I've known of several folks getting electrical heaters; I've never known anyone to CONTINUE using them past the first couple of invoices.
I'm not sure that there's any option for you EXCEPT solar. Heat pumps can work well, but the cost is multiple thousands. A propane pool or span heater will work, but even there, few people use them after the first few invoices.
Sorry!
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