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Frequently Asked Questions

We’re here to help. If you don’t find an answer to your question on this page, please contact your local Therma-Tru dealer. To find a store near you, visit our Find a Dealer page. You can also call us toll-free at 1-800-THERMA-TRU (800-843-7628), Monday–Friday, 8 a.m.–6 p.m. Eastern Time, or email us at

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Can I change out the glass in my door for a different design? Yes. Due to the variation in size, we recommend selecting replacement glass from the same door line. You can only use Classic-Craft glass in a Classic-Craft door. Your Therma-Tru limited warranty will remain applicable, as long as the glass is installed per Therma-Tru written instructions. See Doorlite Glass and Frame Replacement in the Repair and Replacement section of our Site Manual. For product availability, contact your local Therma-Tru dealer.

Can I get a Classic-Craft glass design in my Fiber-Classic, Smooth-Star or steel door? No. The Classic-Craft glass sizes and designs are exclusive to Classic-Craft doors. Because of this, we do not offer Classic-Craft glass in our other door lines such as Fiber-Classic, Smooth-Star or steel.

Is the V-groove in Bevelline glass polished or ground? The V-groove in our Bevelline glass is polished.

How do you determine the rating for privacy glass? The privacy rating is based on point-of-view from the curb, using a 1/2-lite door.

Can I remove the internal blinds from the glass in my door? No. The blinds are enclosed between two panes of tempered glass. If you want to change the style of glass, you should consider replacing it entirely. For product availability, contact your local Therma-Tru dealer.

Can I replace the clear glass in my door with internal blinds? For product availability, contact your local Therma-Tru dealer.

How do I clean the screen vented glass in my door? In order to clean the glass, the screen must be removed. The steps to remove the screen are as follows: (1) Pull window up to its highest position. (2) Stand on the outside of the door. (3) At the two corner edges of the screen, pinch the screen. (4) Shift the screen to the left or the right. (5) At the opposite corner of the screen, pull the screen toward you with your fingernail, a flat head screw driver or a putty knife. The screen should pull out toward you.

What does flush-glazed mean? It is a type of door with glass perimeter moldings flush with the face of the door. Flush-glazed glass is built directly into the door during the manufacturing process, eliminating the need for a lite frame. This glass is not removable.

What type of Low-E glass coating do you use? I need to match the color to my windows. We offer high-performance factory-coated Low-E glass in our doors. For product availability, contact your local Therma-Tru dealer. For more information, call us toll-free at 1-800-THERMA-TRU (843-7628), Monday–Friday, 8 a.m.–6 p.m., or email us at

Do you offer turtle glass? Yes, we offer turtle glass. However, availability may vary by region. For more information, visit your local dealer.

How can I tell if my transom is Therma-Tru glass? Look at the glass. You should see a “Therma-Tru” watermark.

Can I place a tint on the glass in my door? Any alteration or application of any aftermarket films, coatings, tints or other similar products not originally supplied by Therma-Tru will void the glass limited warranty.

Why is there condensation on the glass in my door? Condensation, or "sweating", occurs naturally in the home, caused by excessive humidity, or invisible water vapor, in the air. When this harmless water vapor comes in contact with a surface which is at a cooler temperature, such as windows or doorglass, the vapor turns to visible droplets of moisture. The energy-efficient glass units in Therma-Tru door systems are constructed to keep the glass as warm as possible, reducing condensation build-up. However, there is no such thing as a condensation-free window or doorglass in high-humidity conditions.

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