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You absolutely MUST get an interior door ❤️ 01. Type of Interior Door: Two-Door Hinged I chose a two-door design because I thought a single door would be inconvenient to use, and sliding doors were structurally difficult. It is convenient because I can open only one side normally, but both doors when bringing in large furniture. 02. Brown Glass: Best for Privacy, DIY Interior Design I chose brown glass for a luxurious feel and to block the view. I self-painted the existing beige frame white and the handles black! 03. Save on Heating Costs by Installing an Interior Door With just one interior door, you can definitely feel the temperature difference between the entrance and the inside of the house. It blocks out cold air in the winter and hot air in the summer, so I am extremely satisfied. It is beautiful, of course, but once you live with it, it is an item that feels like a waste not to have.