The profit back then was pretty decent, I was mining from early August or September till the winter months, February if I remember correctly. The heat it was generating during winter could potentially act as a small heater for sure. As you can imagine, having a desktop PC, running 24/7, with overclocked GPUs, it generated quite a lot of heat.
If you have 2 video cards GTX 1080 Ti, then this is a potential heater for half a kilowatt.
This is not enough to heat the room, but it is enough to warm your feet in winter.