I have no intention in keeping my thermostat lower than I need. Keeping warm should not be a luxury, especially for elderly, babies, children, or chronic illness.
If need be I will economise somewhere else. My thermostat is at 20 just now, but within 1 hour I’ll lower it .
Sharon; it doesn't matter what the outside temperature is, the thermostat will heat your room until the temperature at your stat location equals the setting you have used. The worst thing to do is to keep fiddling the stat up and down. Setting it to 30 degrees won't speed up the time it takes to make the room warm. Just decide what temp you want and leave the stat on that setting.