I believe the Vikings open their new fixed-roof stadium next year so that will be one place the cold shouldn't be a factor. Called US Bank Stadium, it will host the Super Bowl the year after (Feb 2018) the Texans host the Super Bowl (Feb 2017).
It's kinda wacky looking but seems to be big and roomy with some monster windows/doors if they ever want to let the breeze in...
Video -
Goodell visits the new US Bank stadium