A 60W droplight can do wonders too like EZ bake ovens, our winters down here don’t get snow but like every 10yr or so but still cold enough for dads 84 Diesel 1ton truck to need some overnight warmth. & rather than installing a block heater & risk another part breaking or failing, went simple & just kept a drop light under the hood each night (sorry don’t know where, just under the hood). & when we had attic jobs he would have a quartz halogen work light warm it up & keep it warm for us. Several houses requested we leave the light it warmed up enough. Dad was a MASTER Electrician by the way.