I remember in uni in the 3rd year in a shared house we tried to save money by not turning on the heating so I bought 100 tea candles for £1 from the Pound Shop and would light 4-5 in the evening. I close the door to my room and it's enough to take the edge off.
But when I wake up in the morning I could see my breath in the air inside my room. It actually feels warmer outside the house!
I doubt it's going to ever get that bad!
See I remember being in uni digs where the electricity was included in the rent price. So we used to crank the oven upto 250 and leave the door open.