I had heater blankets installed on our 2015 Momentum, and now that we're to have a couple of overnight lows close to freezing I'm wondering what the philosophy/practice is on using them? I know where to turn them on, but cannot find any mention in my Momentum manual or the GD flash drive manuals we received. At this point it's only to hit freezing overnight, but be back in the low 60's during the day and this is to occur for 2-3 nights. I'm sure I missed something, but can anyone give guidance on when to use and for how long? Any help appreciated. Thanks.