WOW, how warm does a F 250 6.7 block heater get?

4x4ord wrote:
Even though it's been -20*F outside here lately it doesn't get all that cold in the garage....maybe about 15*F. I don't bother plugging my truck in.

Is your garage insulated or protected against a north wind ?

The other morning it was -31 outside :E :B and inside my uninsulated garage it was -20. I have a thermometer inside my garage and use it to determine whether or not I plug in my vehicles. Both are GM and the block heaters won't cut in till the temp is -18 or colder.