If one has the barrel sealed and brings the barrel in from the cold straight away, no condensation will form in the barrel.
Due to the properties of air and water or humidity, There is less moisture in the air outside in the cold. Therefore there is less humidity in the air.

If the barrel is sealed and maintained that way in the cold before bringing the gun into a warm house ( which has more humidity in the air) as the gun slowly warms up the humidity in the barrel will decrease even more. Due to properties of air and water at various temperatures. The chances of having any condensation with a sealed barrel is none. If you bring your gun inside out of the cold before sealing it you will have condensation in the barrel due to the warm humid air coming in contact with the cold barrel.

In the morning I like to leave the barrel sealed until I get to where I am going to hunt, it allows the gun to cool slowly. Although I have unsealed the barrel before leaving the house many times. If anyone has a failure to fire sealing their barrel and then bring it into a warm house there is something else wrong for it is not moisture as the cause.

I have practiced this since 1984 and have never had a failure to fire. If you could look at and understand the engineering data and charts related to the heating and cooling of air taking into account the humidity (or moisture) you would see that what I say is true.

What I said is based on sealing the nipple or primer area and the barrel of the gun.