Yes, you can adjust the temperature in the roomettes. A control knob is located next to the headrest on one side of the room.
You can explore roomettes further by going to the following Amtrak website. The information there is based on a Superliner Train configuration, which is the same type of configuration used for the Auto Train. You can explore other parts of the train by clicking on one of the links in the lower right corner. https://www.amtrak.com/media/train_tour/superliner/superlinerSLEEPER_CONTROLLER.html
And if you are looking to book a roomette for east coast travel go to youtube and view the Silver Meteor or viewliner vids.
I think there are some variations between trains depending on locale with the west train roomettes having slightly wider beds.
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