It's suppose to get to -30 or colder ambient temp here the next couple of days. Highs will be in the negative teens. I wasn't planning on driving the truck until this weekend. Would you leave the block heater and the battery heater pads plugged in the 24/7 during this cold snap? Anything detrimental besides electric bill?

 

Nope shouldn't be any problem at all.... Like ya said maybe the electric bill, but even at that slightly...

 

I'd definitely leave both plugged in. It's not going to hurt anything.