Explore Products. Our offering of innovative and stylish exterior door systems which are engineered to work together for a lifetime so you can be proud of your decisions you're making for your home. With your Therma-Tru products you will always feel at home. Marvin doors are inspired by how people want to live. They’re designed, engineered, and crafted to bring a sense of quality into every room and deliver uncompromising protection and performance. Whether it’s a classic French patio door, a modern interior door, or a large scenic door that blurs the boundaries between indoors and out, Marvin.