I have an apartment.

Monitor heater and electric baseboard: 65-68 when I’m home/awake (it’s an old monitor so I just set it at the lowest setting). I use the electric baseboard sparingly: when I go to bed and wake up I set it at 65 to take the chill off the bedroom for about 20 mins.

50 for freeze protection (via electric baseboard backup) when I’m not home and overnight.