My little boys room is so cold it feels wet his bedding is so cold I could have sworn they’re wet but they’re definitely not. There’s no signs of visible damp it’s just a cold, concrete house. I want to put the heating on but I really can’t afford it (I’m a single mum going through a messy divorce). What is the cheapest way to heat a room? Would a space heater be expensive (scared my son would touch it though) or would a electric blanket do the trick?