Ford provided one for my brother when he bought his 2008 F350 (it came at no charge with the vehicle). It must have been available that year. I certainly don't see it on my options list for this year. I think it is more for keeping snow out of the intake than restricting cold air coming in.
If you are asking about a winter front, yes, if fully closed and the temp warms up while you are driving or pulling a longer hill, it can/will bring the engine temp up. Either watch the gauge and use the throttle accordingly or open the front a bit. Usually there is a snap or two to open up the winter front without taking it off.