In the past, I’ve configured the heater to turn on automatically (disabling when away or in warmer weather).
It often gets coldest around 5am, so I used to schedule it to come on around 4am and then off at 6:30am.
These days I’ve got different setup (later work start + WFH) and don’t need it, but that method made it so much easier to get out of bed for my early commute for a couple of winters.