I have a new situation: Gwen owns a sauna. She wants to try something new and decides to make the room air tight, meaning no air can escape the room. After trialing this with a few customers she asks them for some feedback. The customers say they really like how there is never a draft in the room but they feel weird when they leave the room and their ears pop like when they are are on an airplane and the pressure is uneven.  But I can use this background: Shown in the Figure below is a cylinder of gas on the left that is at room temperature (300 K). On the right, the cylinder has been heated until the Kelvin temperature has doubled to 600 K. The kinetic energy of the gas molecules increases, so collisions with the walls of the container are now more forceful than they were before. As a result, the pressure of the gas doubles. Decreasing the temperature would have the opposite effect, and the pressure of an enclosed gas would decrease.  What is an answer for this question: Will the pressure of a sealed container increase or decrease when a gas inside it is heated?

increase