I put mine on about a week ago but thermostat at 17 and have felt fine. Kids say they are cold though so they now have a fleecy blanket each as well as a duvet.
Is that ok? I am pregnant so maybe not feeling the cold like I used to. Last winter I had elec blanket on everynight and kids had hot water bottle everynight. Not started this shinanigans yet...... but must be soon!