The last year that was in Iran, I didn't have a proper heater. I just had a small electric heater that I used to turn on when at nights while keeping it besides my bed. I used to wear lots of clothes at home. I did all this to save money. Also the last month's electric bill was 0 rials for me! Apparently if you use electricity below a certain point, you don't need to pay anything. Apparently I used below the limit.