Which of the following is NOT a recommended method to improve energy efficiency of an exterior door?

• A. Install a transparent solar panel on the door
• B. Use insulated doors instead of hollow core doors
• C. Reduce the glass area or use multiple glazing in doors
• D. Replace loose or worn weather stripping

Answer: (A)

To make an exterior door more energy efficient, focus on reducing heat transfer and drafts. Using an insulated door increases resistance to heat flow, cutting both heat loss in winter and heat gain in summer. Reducing the glass area or choosing multiple glazing lowers heat transfer through the door’s glass. Replacing weather stripping stops leaks and drafts that waste conditioned air. Installing a transparent solar panel on the door doesn’t improve the door’s insulating performance and can introduce maintenance and compatibility issues, so it isn’t considered a standard energy-efficiency upgrade.