Our factory used them at the loading dock. I suppose they helped, but it was still cold out there.
What helped even more was an electric opener/closer for the dock’s door. It encouraged closing the door, even if it was just for 5 minutes. The manual chain drive discouraged that.
In any case, try to come up with a solution that encourages closing the door. Perhaps a hydraulic door closer.
Visual starts at 1:28 minutes: